I had a very nice stay at Roberto's. His place is at a great location, relatively quiet but with all the basic stuff very near (restaurants, banks, etc.). Roberto himself is a jovial guy, he'll be happy to give you some ideas on what to do in HK. The apartment is tastefully decorated and the room you'll be sleeping in is at the back, thus quiet, and has its own bathroom. The only thing to keep in mind is that it is a fifth floor walk-up. Don't mind the stairs! ;)