Luigi's apartment is in a fantastic location, only five minutes away in taxi (it cost 5 Euros) but it is easily walkable in ten minutes once you get accustomed to the area! The Colosseum is only 10 minutes walk away and there are lots of nice bars and restaurants near by.
The apartment itself was excellent for our long weekend. The kitchen is a bit small but was fine for us having breakfast etc. One negative thing I would mention was that the shower water pressure wasn't very strong, but other than this it was perfect. I would highly recommend it!