Learn Hardcore Chinese: zhè gè fángjiān dǎsǎo qǐlái bú tài róngyì.

Breakdown of zhè gè fángjiān dǎsǎo qǐlái bú tài róngyì.

Used when counting nouns or when specifying a specific instance of a noun.

There are also classifiers for people, for bound items such as books and magazines, for cups/glasses, etc.

The classifier 个 is a general one that can be used for any of these.

Why is there a 个 in 这个房间?

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:

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.

Why does the sentence use 打扫起来? What does 起来 mean here?

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:

So:

This is a very common structure in Mandarin:

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.