We were a family of 5 who stayed for two nights in July. The flat is easy to find and the host awaited us, so check-in wasn't a problem, he showed us the flat and gave suggestions for eating etc, a nice guy.
Just note that it is a good 15-20 minute walk from the station, which can feel like forever in the July heat! There is a bus stop nearby.
The flat is as on the pictures, the downstairs area is quite spacious. As we were 5, we used the downstairs bed as a single. The table can seat 6 and there is a nice coffee machine. We would have like bigger plates, wine glasses, an egglifter and pasta spoon to prepare a simple pasta dish.
The bathroom is small, but with a nice shower and hopefully the toilet seat will be replaced. The washing machine was also out of order.
There are two lofts, both with a double bed. The spiral stairs are quite steep and narrow. There is a toilet on one of the lofts but it doesn't have a door that can close. The flat is equipped with 2 air conditioners, but we were asked to only use one. It was really hot in Rome and it was bearable in the lofts, but not cool.
The flat is in a student neighbourhood, expect notice and graffiti, but also cheap restaurants and you are a little away from the touristy side of town.
A good stay, but it didn't feel like it was hosted by a superhost.