This very cute café is just next to the Beau-Rivage Hotel a little bit hidden in the Brunswick Park. For lunch they serve 4 different dishes. I haven't tried lunch yet but a colleague has and said that it was very good.
I went there for dinner last night - they serve tapas after 6 pm. The food is great (try the figs with goat's cheese) and the wine is good. It's really great for summer as the terrasse is very cute. I think it's also really nice in winter inside. You should definitely reserve a table if you go in the evening. And I suggest that you get there before being really hungry as it takes a while for the food to arrive. The place is packed every night and the service is a bit slow. But they're really friendly and do their best. It's definitely one of my favourite places in Geneva. Prices are ok, regular Geneva restaurant prices I'd say.
I'd give 5 stars if the service were a bit quicker.