We've been to Geralds place for 4 nights and can certainly recommend it.The apartment is located around 15 minutes from Rom Termini station and nearby a tram station and a metro station, so it's quick and easy getting to the usual tourists spots.
The apartment was very nice and well-equipped with a shared bathroom and a shared kitchen. With a reasonable size the neat and clean sleeping room allows to stay in the room for more then just sleeping and it was actually furnished well.
Gerald as a host was friendly and helpful, he provided us with a lot of information upfront, when we've been there and was available and responsive by whatsapp - he even welcomed us at the front door when we arrived without a need to ring the bell.
Only thing I suggest future vistors to consider: the apartment is quiet near to street with restaurants and bars, which can be a bit noisy at night. However, the windows can be closed and it'll absorb a lot of the noise, but given that Rome is a hot city you might be better off with some earplugs. ;) In any way those places being located nearby can be seen as an advantage or disadvantage - depending on your preferences.