Unfortunately, there was nobody to welcome us on the arrival date and we didn't receive any message about their unavailability in advance or any direction to follow. We knocked at the door for several minutes and asked the neighbor if it was the right address which they confirmed. Renata was unreachable and we had to look for a place to stay in the middle of the night after a long and exhausting trip. This was very distressful and a lot of trouble not to mention the huge extra expense as zurich is an extremely expensive city.
It turned out that Renata was on flight on the arrival date but should have at least given specific directions on what to do.
Renata was kind enough to refund most of the fee we paid and hopefully will leave a personal message if they will not be available to welcome their guests next time.