Mery's self check in hotel is situated in a nice part of Munich with parking (tip!) in the little calm road right behind the house. It was the first time I was faced with an automated system and I found it quite easy to handle -- and the knowledge that Mery was so responsive took the stress out completely. We didn't know what to do with the card at the end of our stay and ended up asking one of the other guests who had their door open. The cards go into a box next to the entrance (duh!). If our experience is generaliseable, some people seem to treat this more like a shared flat, rather than an anonymous hotel where doors are always closed.
Our room was spotless, big enough, cheerful with a window overlooking a calm green back yard. The bathroom was spacious, impeccably cleaned with a lovely shower and the beds were very comfy with fluffy pillows. I was there with my 76 years old mum who found the experience enjoyable so while I understand some of the worries voiced in the other reviews about the place being open access, our experience was altogether very positive.