Would concur with Golden Parrot. Doha has a nice kinda feel to it, although expanding, which can only be realised once you are in the place.
Bahrain is also very nice, and the locals are magnificent. Bahrain does, however, receive a huge influx of people from a neighbouring GCC Kingdom at the weekends though, which sometimes can be a bit crazy!
Both cities are buckling a little bit under the strain of huge increase in volume of road traffic, especially Doha. It's the only off putting factor for me personally.