We stayed with Sara and Marco for a few nights in July and had a great time. The advice and tips they give you before and at arrival are invaluable and it made planning everything so much easier. The room itself is big and comfortable, in a pleasant area. We found it a little too far to walk to most touristy areas (other than the Vatican - amazingly close) but the apartment is really well connected by public transport so not an issue (though budget it in if need be). Wonderful hosts :)