zhè gè fángjiān dǎsǎo qǐlái bú tài róngyì.

个 is a measure word (also called a classifier). In Chinese, when you say this/that + noun, you usually need a measure word in between.

So:

• 这 + 个 + 房间 = this room
• 那 + 个 + 房间 = that room

For many nouns, 个 is the most common general classifier, although some nouns have more specific ones. With 房间, 个 is perfectly normal.

In natural writing and speech, 这个房间 is usually treated as one chunk meaning this room.

Here, 起来 does not literally mean to rise up or to get up. It is a grammatical pattern.

In this sentence, V + 起来 + adjective means:

• when it comes to doing V, it is adjective
• to do V is adjective
• doing V turns out to be adjective

So:

• 打扫起来不太容易 = to clean (it), it’s not very easy
• more literally: when one cleans it, it is not very easy

This is a very common structure in Mandarin:

• 说起来很简单 = it sounds easy / when you talk about it, it seems easy
• 做起来很难 = it’s hard to do
• 看起来不错 = it looks pretty good

So in your sentence, 打扫起来 sets up the action cleaning it, and 不太容易 comments on how easy or difficult that action is.

Not exactly.

In 站起来, 起来 has a more literal directional/result meaning:

• 站起来 = stand up

But in 打扫起来不太容易, 起来 is more grammatical and abstract. It helps form a pattern meaning something like:

• as for doing this action...
• when doing this...
• to do this is...

So the same written form 起来 can have different functions depending on the sentence.

Both are possible, but they have slightly different focus.

• 这个房间打扫起来不太容易
  Topic-first structure: As for this room, cleaning it is not very easy.
• 打扫这个房间不太容易
  More straightforward verb phrase: Cleaning this room is not very easy.

Chinese often likes a topic-comment structure. Here:

• 这个房间 = the topic
• 打扫起来不太容易 = the comment about it

So the sentence feels very natural in Chinese because it introduces the room first and then says something about the experience of cleaning it.

The object is understood from the topic 这个房间.

Chinese often allows the object to be left out when it is already clear from context. In this sentence:

• Topic: 这个房间
• Comment: 打扫起来不太容易

So 打扫 is understood as 打扫这个房间.

A more expanded version would be:

• 这个房间打扫起来不太容易。
• = 这个房间，打扫（它）起来不太容易。

The 它 is usually omitted because it would sound unnecessary.

Literally, 不太容易 means not very easy.

In actual use, it usually suggests:

• somewhat difficult
• not especially easy
• kind of hard

It is often softer and less direct than 很难 (very hard / difficult).

Compare:

• 不太容易 = not very easy / a bit difficult
• 很难 = hard / very difficult

So this sentence sounds a little more moderate and natural than saying:

• 这个房间打扫起来很难。

That would sound stronger.

This is because of a tone change rule.

Normally, 不 is fourth tone: bù.
But when 不 comes before another fourth-tone syllable, it changes to second tone: bú.

Here:

• 太 is fourth tone: tài
• so 不太 is pronounced bú tài

This is a standard tone sandhi rule.

Examples:

• 不是 → bú shì
• 不对 → bú duì
• 不太 → bú tài

But if the next syllable is not fourth tone, it usually stays bù.

Good question. In careful citation form, it is written:

• 这 = zhè
• 这个 = zhè ge

But in natural speech, many speakers say something closer to:

• zhèi ge

This is extremely common in spoken Mandarin.

So:

• zhè ge is the standard written pinyin
• zhèi ge reflects common actual pronunciation in connected speech

As a learner, you should recognize both, but writing zhè ge is completely normal.

太 by itself often means too or very, depending on the context.

Examples:

• 太贵了 = too expensive / so expensive
• 太好了 = great / so good

But in 不太 + adjective, it usually means:

• not very...
• not especially...

So:

• 不太容易 = not very easy
• 不太好 = not very good
• 不太清楚 = not very clear

This is a very common and useful softening pattern in Mandarin.

Yes, you could say:

• 这个房间打扫起来很难。

That means This room is hard to clean.

But the nuance changes:

• 不太容易 = softer, less direct, more moderate
• 很难 = stronger and more definite

So both are grammatical, but 不太容易 sounds a bit gentler and sometimes more natural in everyday conversation.

They are similar, but not always identical.

• 房间 usually means room
• 屋子 can mean room or house, depending on context

In this sentence, 房间 is the clearer word for room.

So:

• 这个房间 = this room
• 这个屋子 might also work in some contexts, but it can sound a little broader or more colloquial

If you specifically mean one room inside a building, 房间 is the safest choice.

It is specifically about the action of cleaning it.

The part 打扫起来 limits the comment to the task of cleaning. So the sentence means:

• This room is not very easy to clean
• not simply This room is difficult

Without 打扫起来, the meaning would be less specific. For example:

• 这个房间不太容易。
  This sounds incomplete or unclear, because 容易 usually needs to tell us easy to do what?

That is why 打扫起来 is important: it tells us the exact activity being judged.

Yes. Very much so.

The pattern:

• Noun/Topic + Verb + 起来 + Adjective

is a useful and common way to say:

• something is adjective to do
• doing something feels/seems adjective

Examples:

• 这本书读起来很有意思。
  This book is interesting to read.
• 这件事做起来不简单。
  This matter is not simple to do.
• 这个问题说起来容易，做起来难。
  This problem is easy to talk about but hard to do.

So your sentence is a great example of an important pattern in Mandarin.