Nice place, at a great location! The Testaccio area is a very nice area to stay in: quiet, and with a lot of good restaurants. Also still close to all the big attractions. The apartment was nice and clean and Alessandro was a very friendly host.
One thing I do have to mention is that the bed was a bit hard, so not suited if you need a super comfortable, soft mattress. Everything else was great and we'd stay here again I think.