Bit tough to recommend something, as many hotels are squeezed in tight quarters and don't always bother putting in a big restaurant or bar in a city that is filled with them. That being said, I would check out The Mandala with the accompanying QIU Bar. It's not necessarily in an "exciting" area of town, but it is centrally located for sightseeing and shopping and located adjacent to the S-/U-Bahn that will easily take you to edgier parts of town.