Huttenpalast takes a creative approach to accommodations. They've turned an old warehouse into a unique hostel type location. In the warehouse are cabins and trailers they've turned into little bungalows with an indoor garden, each cabin has its own sitting area where we enjoyed eating the included breakfast of croissant, fruit and coffee/tea. There is a shared bathroom, one for men and one for women, that was super clean. No frills - you have to bring your own toiletries.
There is also a very pretty outdoor garden, cafe, free wifi and bike rentals - all of which we took advantage of. There is also a hotel attached to the warehouse, so if you want something more private you can stay in one of the very spacious rooms (I did one night out of the three that I was there).
I visited Berlin with my husband and two other friends (another couple) for our pals birthday and this was really the perfect place to stay. There are tons of great affordable bars and restaurants in the area. Easy access to the train, too. We rented bikes and got to many sights within 15 minutes (when not getting lost...). I got in a bike accident and Sarah, one of the hotel owners ran to the pharmacy and got me plasters, antiseptic, etc. She and her partner are so nice, helpful and great to be around.
We met lots of people from all over the world at Huttenpalast, which was really nice. Only downsides were that the warehouse could be a bit noisy in the morning with people roaming around and some younger kids (5-8 year olds), but people were respectful for the most part. The warehouse could use a bit more ventilation as well. I'm sure that they'll work out all the kinks though :)