The place is unique, it is on the whole good value for such an experience. The location is good but not most excellent if you want to stroll easily in the central parts, it is a good 20 minute walk to colloseum, then to centre another 15 minutes. Marco and his wife were very reliable extremely helpful and are responsive to all questions. Excellent hosts. There is a smell from the wall, and in modern day terms of damp. In summer this didn't cause any health issues but the construction of flat next to ancient wall makes this a part of the experience. However I do believe it may well be something to consider.