We really enjoyed our stay in the Mariposa apartment. It's spacious, comfortable and in a fantastic location. You are able to walk to most of the sights though the Forum and Colosseum are more easily reached by bus. There are loads of good restaurants and bars around, many just a few steps from your front door.
Eva's brother met us at the apartment and showed us around along with a brief guide to where and where not to go. There is also a folder in the apartment with lots of information about the sights and places to eat.
We really enjoyed our stay and would happily recommend it to others. The only thing people have to be aware of are the two flights of small, steep winding stairs to get to the front door. This was not a problem day to day, but getting our big luggage down was interesting! It might also be a problem for people traveling with young children.