I would not hesitate to stay at Christophe's apartment again. The location is fantastic, since you can catch the bus right across the street and public transport in Geneva is outstanding and will get you pretty much anywhere in a relatively short time. There is also a cafe right next door and a store just a few meters away.
The street is quiet, so one can get a good night's rest. The apartment itself is very clean, spacious, stylish with beautiful high ceilings and a cosy kitchen. We were given ample towels and very much appreciated the complimentary bottle of wine on the kitchen counter! :-)
And let's not forget that the building has one of the coolest elevators I've ever seen (from 1928 with a wooden cabin!); even though the apartment is only in the first floor, I just HAD to take it once! :-)
Christophe is a wonderful host and was available right away, when we needed to contact him with some questions.
There really isn't much more one can do to the space to improve it - if I were pressed to come up with something, I would make two minor suggestions:
1) A more light-blocking curtain in the bedroom, because I personally like my room pretty dark, but that might not be everyone's preference (and of course one can also wear a sleep mask)
2) a plug with a USB port for under the lovely glass desk in the bedroom, would have been very useful to charge a phone or computer even without a European adapter (which we forgot at home).
In summary: All of us were very happy with our experience at this Airbnb and would highly recommend it!