While the woman who we talked with on the phone spoke English very well and was very easy to get in contact with, the man who checked us into the apartment knew virtually no English. He was very nice and we eventually got everything sorted out. It seems that a logical solution to this situation would simply be to have a sheet of paper with all of the pertinent checkin/checkout details written in a number of common languages (English, French, Japanese, etc) and simply have us sign it at the bottom and call the number if we have any questions. That way the man checking us in could simply give us the keys, give us the papers, and sign for the payments.
But again, it was not that big of a deal and after about 15 minutes we were were all set. The apartment was easy to find and they were very timely in meeting us there, but you will need to plan having a way of calling the number they provide when you are within 30 minutes of arriving.
While the accommodations are a bit more rustic than resort, it was nevertheless a fantastic place place stay for several days. We felt VERY safe and secluded even though we were in the heart of the city. You receive a key to the main door on the street, which is about 10 yards across the street from the church. There is one flight of stairs to get to the elevator which then takes you to the top of the building. Once there, there is another locked door to let you onto the terrace where the apartment is. Very easy to get into and out of and you are the only one who has access to the terrace where you can enjoy a 360 degree view. The apartment is very simple and sparse, but clean and charming, which was exactly what we were looking for. The terrace is fantastic place to lounge around after a long day and drink some wine or snack on some fresh pastries.
Bottom line: if we return to Rome this will be our first choice for lodging.