I have spent almost 3 weeks in this apartment and it was just great!
Everything is just as shown on the pictures - the place is sunny, bright, clean and really charming. Alessandro welcomed me personally and also gave me recommendations and suggestions for my stay in Rome.
The apartment is in a beautiful old, but renewed building. It's located in a nice and quiet neighborhood. There's a porter/doorman for extra security, who is also very friendly and caring for all the guests. The apartment is in walking distance to the Villa Borghese Park (3min), as well as the "tourist" city center (15-20min). There are nice cafés, bars, restaurants and supermarkets nearby. If you don't like to walk and want to use the Roman public transportation system - you can take busses in all directions from different bus stops right around the corner.
Alessandro was also very caring and responded almost immediately - no matter which time or day.
Long story short: RECOMMENDED! If you are looking for a place to stay in Rome - search no more.