I am offering my cozy flat for 4 people on the 5th floor, without elevator. ;)
The flat is close to the public transportation, a great night life, bars and restaurants. Also supermarkets are around.
Two people can sleep on a cozy sofa, the other two will sleep in a private guest room with a Casper mattress.
There is a Tv in the living room, without excess to german channels (cause they suck ;-)), but you can use YouTube or the www on it.
Feel free to get in touch. :-)