Zeitraum was a few min walks from the conference venue so it was really convenient.
Looks like it was popular among students so I occasionally heard some noise but it wasn't that distractive. The room was really clean which I was happy about.
One thing annoying was that the bathroom was shared (which was communicated beforehand) so depending on who you share the bathroom, other people may make a bit of a mess. One thing I was not happy with is that there was no lock so I felt a bit uneasy while using the bathroom, though no one open the door while I was taking shower, etc.
Overall, it was worth the price given I didn't find any other hotels with that low price. If you are looking for somewhere better than a hostel, definitely a good choice.