We stayed here as a group of 5, which was perfect for this apartment! The apartment itself is really well located (we walked to the majority of the main tourist attractions) and is close to a lot of cafes/restaurants etc.
Heating worked really well, and Selene was very friendly and even checked in on us on our last day to wish us a safe trip home! She also arranged the transfers to and from FCO for us, which was great and on-time with an English speaking driver and comfortable van.
Only negative was that the bathrooms could do with a bit of a spruce up, but that wouldn't stop us staying in this place again!