The registration was irritating. Sequential emails - just ask everything at one time, OK? And be aware that someone coming to stay may be out of mobile/email contact.
But the phonekey system? Totally borked. For heavens sake, use a keypad. We had trouble with the phonekey for first check-in, as did the couple we saw trying to get in as we went out, and the random guy in the lift commented that the phone system was causing grief for many.
Then it decided we should be refused admission when we came back after dinner the next night, leaving us stranded. We found a contact number in tiny printing on one of the many emails. OK for us, but another of our party had a flat phone battery, so obviously couldn't read the email OR use the key function. Technology over common sense.