The Alhambar is one of my favorite bars to go to in Geneva. It's a great place to grab a drink after work and during the weekends. There's a DJ playing music and the velvet couches are comfy if you can get a seat. On the weekends, it gets quite crowded (some guy burned me with his cigarette!) and the guy to girl ratio is along the lines of at least 5:1.
If you stick with the beer on tap, you won't go broke - Kronenberg, a French beer, is pretty good and only Sfr 3.5. Mixed drinks can get quite pricey though, but I recommend getting the strawberry daquiri with vodka. It's very fruity and refreshing. If you don't like the taste of alcohol, definitely go with the vodka as the strawberry daquir with rum is very strong and tastes medicinal.
The decor can be described as either swanky or cheesy -- feathers hanging from the ceiling, zebra print lampshades, velvet couches, vintage furniture.
Like all bars in Geneva, the Alahambar closes at 2 am. It's closed Mondays, but open every other day. Check out its website at www.alhambar.ch.