Staying over in Berlin for WarpStock Europe 2018 shouldn't be a problem; there are many, many hotels, pensions and places like AirBnB to stay. Here's a short selection, but these are definetely not the only places to stay!

First off is of course the NH Berlin Alexanderplatz where the conference is held. It's not the cheapest but it has amenities like a fitness area, a spa with steam room, sauna, cozy bar and a restaurant. It also offers "Lazy Sunday" late checkout (at 17:00!).

For a bit less money there is the Ibis Budget hotel at Alexanderplatz which is only 15 minutes of walking or 2 tramstops away from the conference hotel.

For even less there is the Generator hostel near the Landsberger Allee S-Bahn station, also at 15 minutes walking distance.

If you want something a bit more luxurious try the Vienna House, next to the same S-Bahn station, or Hotel New Berlin.

If still not sure, checkout sites like booking.com, Tripadvisor or Trivago.