I was in Geneva for work for almost two weeks. It was my second stay at Van's apartment in central Geneva and it is as good, convenient and practical as the first stay a year ago.
And when I say it is central, it is central. The place is right behind the main train station (Cornavin). You can see the tracks and the parked trains from the bedrooms. Walking to the station itself takes about three minutes (or about five if all the way to the tram stops in front of train station) and from there you can catch any ride you need, including the taxis. That also means you have easy access to the supermarket and other bakeries at the station.
Everything in the apartment is as advertised and in good working order. There is very little noise from the street and the train station, nothing loud enough to disturb your sleep at all. Outside noise should not be a concern if you are thinking about it. This area behind the train station is quite residential with no establishment drawing a crowd. The only big buildings nearby are the offices of the Swiss train company and the Swiss postal service. Also, I never saw questionable individuals loitering around in front of the apartment.
As for our host himself, Van is a dependable and friendly person. He is also quick to respond via Airbnb messages when there is a question or request during the stay. I feel very comfortable having conversation with him, knowing that he will try to interpret my less than perfect English in a good way, and that he is a nice and accommodating host to begin with.
We look forward to staying at his apartment again on our visit to Geneva next year.