This is a great apartment! We were a party of eight (including four teenagers) and we had plenty of space. The walk from the train station is about fifteen minutes, and kind of confusing, but once you get the route it's easy enough. Upon arrival we took a cab, which was better than searching for it. After that, we walked.
The apartment itself was comfortable and spacious. Best of all, it had air conditioning!
We'd definitely stay there again, next time we come to Rome.