We (4 people) stayed at Marco's apartment for one week. The apartment was lovely - very clean, nice and modern furniture and with all important things for cooking etc.
The area where the apartment is, is good for shopping. If you wanna go for a drink in the evening there are no nice bars around. But the connection to local transport (especially bus) is good. There are many stops around. Metro is a bit far. Train station is also around (15min by foot).
To go to the city centre and also to the Vatikan is also possible with the bus lines. Takes some time, but it is ok. Just difficult to find out where all different bus lines are going. Our recommendation: Bus 170, stops directly at two stops near the apartment and goes to the centre.
Marco was a super nice host, he was explaining many things about the city!
We would definitely recommand this apartment and probably we'll even come back on our own! :-)