The first thing I have to say about this flat is that the photos do not do it justice. It is a really really great place to stay and I can't recommend it enough.
The building is really nice and secure (and has a lift which was great for getting cases up to the 5th floor flat!) and we were met by Matteo who let us in and explained how everything worked including all the keys and lift etc.
It was in a great location, literally next door to the train station which was very handy when we had to get up early for a 8am train! This was also useful for catching the metro, which is also at the station, to the Vatican on the other side of Rome. Only a couple of minutes walk away was a whole street full of shops and restaurants (all at very good prices) which we made use of. The walk to the Colosseum only took us about 20/30 mins (once we'd figured out the map!).
The kitchen had everything we needed and we actually cooked for two of the nights that we were there very easily. There was even a corkscrew, which was especially handy since none of the wine in Italy seems to be screw top!
The whole place was clean and comfy and a great place to relax after a tiring day exploring Rome. Big recommendations for this place!