I enjoyed my very short stay (one night) at Jean-Philippe and Xuong's place. It is really centrally located (next to train station, lake, supermarkets, restaurants, etc.) and the room with ensuite bathroom is really lovely. I did not get to speak much with Jean-Philippe and Xuong as I arrived late and departed early the next morning, but they were very welcoming. I would certainly go back next time I am in Geneva.