We stayed at Maison Romana for several days in September.
The appartments size is sufficient (1 bedroom, 1 bigger living room incl. kitchen, 1 bathroom). It was a clean and there was even a cleaning service during our trip, to change sheets and clean the appartment!
The location of the appartment is okay. It is very calm there and only 20 minutes to walk into the city (e.g. Coloseum). The only downside has been that, during our trip, the nearby Metro Station was closed. Therefore we had to go by bus or walk.
All in all, it is a great appartment and I would recommend it to anyone, who searches for a little appartment for a stay in Rome.