We had a very pleasant stay in Marco's apartment. The flat has an excellent location - right in the centre, approximately 5-10 minutes from the Vatican and 2-3 from Piazza Navona. The personal check-in was very helpful with Marco's friend Mascia. The flat was clean and well presented. The only niggling point I would have (and it is only niggling) is that the shower was not particularly good (the water slightly dribbles from the head). Also note the flat is up some stairs so bear that in mind if you have heavy luggage - although we had no problem with this. Overall I would gladly recommend staying in this excellent apartment.