Maurizio was very helpful with checkin and answered all questions promptly. I stayed at the flat for a month and he gave me privacy but was courteous and checked in with me a few times during my stay.
The apartment was sufficient, but in an incredibly busy area. I brought earplugs so I was able to sleep. The crowd in Trastevere gets drunk and loud pretty much every night, not just weekends and they walk by the apartment singing, vomiting, etc. Again, bring earplugs and you can ignore this. It's the price you pay for being able to walk out of your door and into a cute neighborhood with nice restaurants and bars. Weigh your priorities. The bed is very comfortable.
From the day I moved in, the apartment smelled like cigarette smoke and it never dissipated. I think it was somehow coming through the walls or something from a neighboring apartment. I had to leave windows cracked 24/7 to let the smell out, which made outside noise louder.
It was not a huge deal, but the dishes were dusty/a little dirty when I arrived and there were no bowls other than a large mixing bowl. The shower trap had someone else's hair in it and I really didn't feel like cleaning it out, so I just moved the trap any time I wasn't washing my hair otherwise the drain went pretty slowly (it didn't back up).
I worked remotely and the wifi connection was stable and fast on my computer. My iPhone was slower, not exactly sure why. I was able to do video calls and stream movies no problem.