Probably wouldn't recommend the Generator as a lone traveller. I met a Hungarian fellow on my second night there who I chilled with in the bar, but I get the feeling I was lucky. It is indeed full of teenagers and group travellers. It's also a fair way out of town, which is alright if you have friends to keep you company heading into town, but it gets tedious walking in every day.
Better to get somewhere smaller and closer to central Berlin I think.