First, let me say this is a GREAT place to stay with EXCELLENT location. It's cute, it's nice, and you'll almost certainly be really happy with it. The hosts were easy to work with and they even went above and beyond writing a helpful guide of places to checkout (which we did- one of our best meals here was their recommendation!). Being so close to the Colosseum is awesome- and able to tell any taxi to just drive you there is really nice! We also used their washer+dryer which helped quite a bit since we carried minimal clothing (2 week trip with just our back packs). They also had a few snacks for breakfast available, water, and basics like tea which was really considerate.
So to be clear, I REALLY wanted to rate 5 starts- and the ONLY reason I'm doing 4 stars is because of the A/C and low hanging support beam in the bedroom. This is only a problem if: you like sleeping cool and/or you are a medium-tall person: probably mostly concerns for Americans.
First, the A/C problem. So there are actually 2 A/C units- and they provide a lot of cooling power. But the problem is the only sleeping area is upstairs, and no matter how high I cranked the A/C the upstairs bedroom was always hot, even if the downstairs kitchen/living room got pretty cool. There was a fan by the bed which helped- but if you come from a warm weather location in the US and are used to being able to get A/C down to ~72-74 F to sleep, that's not gonna happen. We went in September, and it felt like the temperature where the bed is never dipped below 76-78 F and sweated very easily at night. There is a door on the bedroom that leads to a balcony on the same room as the living room- I was hoping I could open that door to circulate the air but it is locked. The other issue with the A/C is that one of the units makes a noise like the fan is hitting something, which is a bit loud and annoying. I turned off that unit if I was in the room watching TV.
Second, the low-hanging beam in the bedroom. I understand there isn't anything that can be done about it- it is a support beam. But if you're medium-to-tall (I'm 5'9") there's a good change you're going to hit it. It's right in the way, and you're going to forget about it. I remember telling my wife "I'm going to hit this beam at some point during our stay"- I avoided it most of the time but indeed hit my head somewhat hard at least twice.
All that said, the pros outweigh the cons- would recommend this place and only mention the above caveats for those who really care about temperature or are taller.