The location is in front of the central station so for us this was great as we only stayed for some days and were travelling by train. But be aware that during the nights you can hear some noise of the street as it is not isolated that well.
Moreover there was quite a big kitchen, with all the things you need. The only thing we didn't like so much was the fact that the commin fridge and freezer were full with food of others which seemed to live their permanently. They putted notes with it like "don't use this bench, it is from room number 5" which basically made that there wasn't any space left for us to leave smth in the fridge.
Another point to be aware of if you have chosen for the shared bathroom is that you have to share it with approx. 4 rooms. In our case unluckely we had to wait several times, which can happen of course, but just be aware that you better can wake up a bit earlier.
Then about the system of Vikey, in the beginning it was a bit weird but once you know how it works, it's easy ;)