Max was super helpful and communicative, as soon as we made the reservation he was sending us local tips and recommendations. He met us at the flat, earlier than the check in time which was nice. He also gave us a quick tour of the neighbourhood and left a bottle of wine for us, how thoughtful! The flat was great and spacious and packed full of everything you would need, and it seems like there may have been other guests staying as there were other flats as well. The only thing I would mention is that we stayed during the week and during term time, so about 8am every morning there were noisy children passing (2 mins) on their way to school . Obviously this cannot be helped and you get used to it, but it was a shock the first morning (probably after a late night!)
Location wise, it's not right in Rome City centre but it is easy to get to. It's a 2 min walk to the nearest metro station Pigneto and a 5 min train ride to San Giovanni, which is also on the Metro A line. You can get pretty much anywhere from Pigneto for €1,50 and most stations you can Tap and Go using a contactless card/phone.
All in all, would definitely recommend a stay at Max's, you won't be disappointed!