Breakdown of Il quartiere è rumoroso e, per di più, c'è muffa nel bagno.
essere
to be
e
and
c'è
there is / there are
il bagno
the bath / the bathroom
Questions & Answers about Il quartiere è rumoroso e, per di più, c'è muffa nel bagno.
How does per di più differ from a simple connector like inoltre here?
Why are there commas around per di più?
Just like with 'what's more' in English, per di più acts as an emphatic aside here. It interrupts the natural flow of the sentence to draw attention to the escalation, so it is set off by commas. You will frequently see it paired directly after the conjunction e (and).
Does per di più always pile on negative things?
Why isn't there an article before muffa (like c'è la muffa)?
Muffa (mold) is being used as a general, uncountable substance here. Just like in English, you can often drop the article in Italian when simply stating the existence of an uncountable noun with c'è. However, using the partitive article (c'è della muffa) is also very common and would be perfectly correct.