It all comes down to "location, location, location". A very few minutes away from the train central station, Jenny's place is hard to beat on this one, thus making it a very convenient hub from which you can explore Geneva. The place was also very clean, appearance as advertised, and could easily accommodate two people on a large bed, and two more on sofa beds. The view over the mountains and the city was superb!
The only downside I would say comes down to its proximity to the trains itself as it can get slightly noisy in the early hours in the morning, particularly if you are not a "heavy" sleeper. My two-cents are two lower down the metal curtain on the window that faces the train tracks - it does help to minimise the sounds from the outside!