I stayed two nights in Lipno, and I was extremely satisfied with the apartment that I rented. The concept of self check-in was spot on, and reduced any interference from staff to essentially zero, which was precisely what I was looking for.
The facilities were very clean, very well equipped, and of solid quality. The stay was for purposes of relaxation and stress reduction (running, hiking, sleeping). It was really perfect. I plan on coming back here during the summer. I would highly recommend this facility.