Costanza’s place is in a great location. It is easy to get to from the station. The AC works brilliantly and there is an elevator. These are the positives.
It is on the 5th floor of the Hotel Selier. Knowing this in advance would have been nice as we were harassed by the hotel staff while waiting for the housekeeper to let us in because Costanza was away for work. We had no shower while we were there (over the weekend) and water ran in the toilet all day and night so I think there was a plumbing problem. The walls are paper thin. We heard everything from the room next door so do bring your earplugs. We only took a cab once and only to make it to the Pentecost service at the Pantheon on time. Otherwise, we walked everywhere. I would recommend this place for those wishing to stay near the station and not wishing to carry luggage up winding flights of stairs.