The Odyssee hostel is a really good welcoming vibrant place to stay. The staff are super helpful and all fun and well informed of Berlin. The room I got was perfect and as I was a solo traveler I got a room with other solo travellers which meant it was pretty quiet if you needed to sleep and everyone was really respectful.
Downstairs there is a pool table and cheap beers and there is coffee for free to perk you up when needed.
There is a wall of info and recommendations as well as an immense amount of flyers and info on local things to do and see as well as cool parties that are happening.
The staff are all bi lingual and very accommodating.

The Odyssee was a really good base to explore Berlin from. highly recommended.