I can only agree with all the other positive references.
Gerald's apartment is perfect for spending some days in Rome. It's situated in a hip area with great restaurants and bars away from the tourist crowds. Still you can go into the city centre quite easily (once you've figured out Romes crazy confusing public transport-->bus and tram stops are really close to his appartment, but they have different names, don't mix them up like we did ;) ).
Gerald had loads of usefull information (e.g. for pizza places..) for us and was always reachable if we had any further questions. The breakfast, which he provided was also pretty nice.
Everything was great, I can't think of anything that could have been better about this place and host!