We stayed here for two nights. The first night, we booked 2 of the 4 rooms:
1) Henri (good for 3) - 2 people stayed in and it was just right. If there was a 3rd, it seemed like a tight fit.
2) James (good for 4) - more than enough space with luggage include!
On our second night, we booked the whole Evolutionism apartment. The other two rooms James and I forgot the name of the one, had more than enough space for luggage and occupants as advertised. The apartment was also clean and had decent amenities as advertised.
Overall, the stay was great! Right by the entrance to the Vatican Museums, which was our main purpose of booking this. Great neighborhood area too-- lots of restaurants within walking distance and two supermarkets in the area.
The only things that could have gotten better: 1) pre-stay communications - it took some time to get a reply when I had inquiries or requested transfer booking options (which they list as offering) 2) check-in - could have gone seamless if they posted check-in instructions beforehand. The booking said that codes will be posted 48 hours before, but only the WiFi code was posted on the booking details. 3) there are a few steps of stairs to get to the front of the building - I found out by looking at street view maps of the area. this was definitely challenge since we were a big group with lots of luggage.