Although the building is quite old with no elevator and doesn't give you a very good first impression at your arrival Martine's department is very very clean and comfort. The room is very spacious with a nice comfortable bed, suitable for two persons. The bathroom (used in common with Martine) is very clean, always with hot water available. The kitchen is available with hot coffee and breakfast at the time we chose.
Martine provided us with any information needed and was always available, polite and smiley.
I think one of the best things was the appartment's location. 4 min walk from th ecornavin station and nearby the city center. We could walk til the lake and in 2 min we could take any bus/metro/train needed to go elsewhere.
I would definitely chose it for my next trip to Geneve.