5 Daphne Will - a month ago
I went with a large group (~150 people) that booked most rooms and conference rooms. The bedrooms (two bunkbeds each) were in very good condition - clean, solidly built, good personal lockers and adequate ventilation. Only the shower drains were clogged with hair (in several of our groups' rooms), though this was easily fixed by hand.
The food in the cafeteria was fine. Nothing special, but perfectly edible, healthy, with enough variation for 4 days' stay, and they were willing to provide vegan options for our group. The cafeteria itself was rather noisy, though, and conversations quickly became hard to follow. Someone from our group mentioned this shouldn't be too hard to fix with some basic sound-absorbant tiles, but I'm not an expert.
The halls and conference rooms were again in good condition: clean, well-furnished, with projectors and other conveniences available. The acoustics were again a bit subpar, but not terrible.
The location near the Wannsee and forest is great for walks or a swim. Unfortunately the garden behind the hostel is fully enclosed by fences with the waterline fully taken up by boats and jetties, but a short walk along a gravel path (make sure to bring footwear!) takes you to a large, clean sand beach.