I stayed in Nathalie's apartment for one night while I was attending a side event at the Palais des Nations. The room was cozy and private. Nathalie had thought of many small touches, like a tea kettle with an assortment of teas, a chocolate bar, and a universal adaptor. Lighting was good and there was a small desk for work. This would be an ideal place for an NGO advocate attending sessions at the Palais des Nations, which is about a 1/2 hour walk from the flat. The shower was good and is for exclusive use of Nathalie's guests. The toilet is also for guest use only, although it is worth pointing out that it is next to the kitchen and not completely private. This was not a problem for me but it might be for some guests. The bed is a single bed, and might be a bit small for a very tall person.
The flat was easily accessible from Cornavin rail station: it's just three stops on the 14 or 18 from Gare Cornavin to Servette, and the flat is a 5 minute walk (if that) from the tram stop. All in all, great value and a very nice host. Thank you Nathalie!