First of the good things (which are way more). Paolo is a great host - fast to communicate and very helpful. The apartment location is really good - close to the lively part of Trastevere and close to Gianicolo Hill. The beds are very comfortable and there are all the amenities one might need. You can even cook for yourself. The wifi is very good.
Unfortunately there are a few things because of which I can't give this 5*. The bathroom was really moldy. The drapes are see through so forget about sleeping past sunset. There is a lively bar just below the apartment and it gets loud at night - very loud. The soundproofing on the window is very low so closing them does not help a lot. If you are like us and walk 20 km every day, the noise won't trouble you sleeping. But it will most people. Bare in mind that this is on a high floor so you have to walk a lot of stairs. There is no wardrobe in the bedroom which might not sound like much but causes daily inconvenience.