So, my OH has signed up for a mangement program at HEG (Carouge) that runs from Sept. until June next year. Classes are every second week on the Friday afternoon (until 21:00) and Saturday morning (as of 8:30). This makes the back and forth from Morges on train/tram in GVA a bit of a stretch.

We are therefore looking for ideas or directions to look for a one evening accommodation in GVA every second Friday. This could be any very inexpensive hotels, actual suggestions (names) of airbnb people (although most require 2 nights) or possibly a "couch surf" type of situation, or even someone who does not stay in GVA over the weekends. Basically she is just looking for a place to sleep (eat a salade) and head out in the morning. Obviously she is working with a budget that does not allow the 5* hotels in GVA. 

Any suggestions you might have are very much appreciated.