We received a 5 digit pin via email to retrieve our transponder to enter into the apartment a few days after confirming our booking. It was close to a 7-minute walk from the Oerlikon train station, a stop away from Zurich HB main station. There wasn't a clear sign to the entrance of the inn, we had to ask the restaurant staff next door in order to locate the entrance.
Once at the entrance, we took about a minute to figure out the machine in order to retrieve the key as once again there was no clear instruction nor staff. The room was fine, although the toilet was a little small and the balcony was tiny with no good view whatsoever.
The most annoying part was that the Wifi password required a phone call to retrieve and as tourists for a short trip we did not purchase a phone line hence we had no access to the internet.
All in all, it was pricey for the minimum or no service at all, a clean room but no amenities nearby and requiring a train ride from Zurich train station which was slightly inconvenient.