One day I was looking for a fancy but decent and affordable location for a networking event and I stumbled upon Meisterschueler. A combination between art gallery and bar, with a nice view over the Spree - and a couple of minutes away from S-Bahn Friedrichstrasse - and perfect on good and bad weather it is a good option if you are looking to host a conversational event. The price of the rent includes the drinks and if you want food, you could bring your own catering. The exhibitions are changing periodically, but you will have for sure a creative background. If you are looking for presentations or you need to use your computer, you can be provided with appropriate technical facilities.
Good to have in mind for a next event, isn't it?