Dishonest
Lots of hidden fees, and they always look for excuses not to return the deposit. Also, most of the houses are old and renovated with low budgets. They are quite good at making the houses look good, but once you get to live there, you realize how bad they are. And lastly most of the flatmates are Italian people that are stupid enough to get scammed in their own country.
The only reason you don't see many negative reviews is that they threaten customers so they don't post negative reviews.

