Very friendly hosts; there was no problem with letting us in very late at night (our plane arrived around mid-night) and Fabrisio was waiting for us to let us in.
What's more, after the visit, Annalisa sent me some documents via DHL which I had forgotten and by mistake had left in the flat. That was really really helpful.
Great location and a very nice and spacious flat. And very peaceful and quiet. Only ten minute walk from Colosseum.