This place is FANTASTIC! The building is very quiet even though it is one block from the Colosseum. NOT KIDDING...ONE BLOCK!! We were so surprised when we first arrived. You come out of the front door (it has a security entrance/private gate) go two doors down and turn the corner and there is the Colosseum. Everything is within easy walking distance. The metro stop is the same distance as the Colosseum and you can get just about anywhere you want to go from there. Roma Termini Station is two stops away. You can also easily walk if you choose to. Trevi fountain is about a 20 minute walk and it all feels very safe even late at night.
There are great restaurants right outside the front door. Also a wonderful 24 hour supermarket around the corner. It just doesn't get more convenient than this.
Andrea is a great host. He explained everything very clearly and gave us great advice on how to get places easily and quickly. We also had a little problem with a door that got stuck and he was there to fix it within a few minutes.
The building and the apartment are vintage 1970s down to the Orange tile in the bathroom. We thought it was cool!
If you are planning a trip to Rome I highly recommend trying to stay here.