I've been to a couple oh hostels all around Europe and thus my expectations are never very high.. but Inn-Berlin case everything was different from what I've known:
The owner Mr Ralph was exceptionally kind and helpful, a true gentleman. As soon as we told him that it was our first time in Berlin, he made sure that we knew all the useful info for transportation and sightseeing. I might say he was one of the best tourist guides I ever had and he wasn't even a tourist guide!
The hostel was very spacious, tidy and very clean with big comfortable beds. The common place was very big and inviting to meet new people. The kitchen was fully equipped and one of the cleanest I've seen in any hostel. Free wifi was also a bonus
Thanks to Mr Ralph who made our staying a lovely experience! I would definitely like to come back to this hostel, and of course to the wonderful Berlin, a city that you the more you stay, the more you love it!