Had a great stay at Martin's. The flat is centrally located -about 8 minutes walk from main Geneva train station and a couple of minutes from tram/trambus stops. But it is not noisy at all. The weather was unseasonably hot during my stay but there's a Dyson fan in the bedroom which worked wonders to keep me cool at night-time. Any issues/questions, Martin was extremely accommodating to sort out for me. I highly recommend his place.