BERLINERS: You can use all public transport (except trains to/from airport) for free for one week, if you have a a yearly subscription with the BVG. Beforehand, make a paper copy of your BVG card and your ID or passport, of both sides. During the office hours of the ATAC office in Termini station, go there (2nd floor downstairs from the main entrance) and show it to the clerks. They will take the papers and hand you a 7-day pass for free. The BVG doesn't have the info on their page, but several websites and newspapers mention it. We tried it, it worked! There is some "internet point" shop near the station where you can make the copies if you forgot to bring them.
Now for the real review:
I loved my stay! We were received and treated by Adriana, her daughter and the flat mate with great hospitality! They were all super friendly, welcoming and helpful. We were granted a spacious shelf in the fridge to store our food, and it even contained a Prosecco as a welcome gift.
The location is very good. A tram stop is 2 into the city is 2 minutes away, but walking into the heart of the city or the Vatican area is easily possible. There are also some busses that stop 5-10 minutes away, which we used without problem.
The flat is right on the border of a lively neighborhood, which is great at any time of the day for food and drinks. In the evenings it gets quite busy with a lot of people and bars. Due to the border location it is entirely possible to avoid this crowd, if you don't like it. The guest rooms aren't facing the street, but a small courtyard, which is good because the rooms stay cool and quiet for undisturbed sleep. Our room had a water boiler, instant coffee, tea, cappuccino, and a hot air dryer for hair. We also got a bunch of fresh towels. The room has access to a small balcony, to dry the towels or smoke. There is no AC but a big fan over the bed, it worked ok for us. Speaking of sleep, the bed in Mon Petite Coeur is fantastic. I liked the room and the entire flat a lot, as you can see from the pictures there is a lot to discover on every wall and corner, I found the style lovely.
All in all we had an excellent stay and would recommend this to our friends. :)