I just moved out of Mozart's Arlington building in Shadyside, and I wanted to write a review to counteract some of the negative press that Mozart has been been getting on Yelp and elsewhere. The reason I moved out was mainly due to increasing rent and my desire to check out one of the other neighborhoods in Pittsburgh for a change of pace.
Personally, I had no real issues with Mozart. The building was always kept clean and everyone I talked to -- from the maintenance guys to management -- was polite and helpful. The rooms in the Arlington were very quiet (I never heard my neighbors except for when people were talking while through the hallways). Heat (since it's included in rent) was reasonable, if a little hot at times. I'd say the overall condition of my apartment was above average. It's a really old building (~1910), but the amenities were kept reasonably up to date.
A couple notes that people might want to be aware of:
-Mozart requires that you let them know if you're moving out in February (6 months before your lease expires in August). I think that's pretty excessive, but it's their policy.
-Mozart does not require a security deposit, so I'm not sure why some people are saying Mozart took their security deposit...
-They have a "broom clean" policy which means essentially that as long as your apartment isn't gross when you move out, it's cool. So when you move into a new Mozart apartment, don't expect it to be spotless.
Overall, I would say Mozart is a pretty safe bet if you're looking for an apartment in Pittsburgh. They have a few quirks, but I didn't really mind and would definitely rent with them again.