We arrived earlier in Zurich than expected, so we also arrived at the appartment half an hour early. At first we were unsure if we were rude appearing earlier than we were expected, but Ramona happily welcomed us and showed us everything we needed to know! After an 8h train ride this really made everything better.
We spent most of our days outside exploring different parts of Switzerland anyway, but the time we spend inside the appartment was very nice. We didn't communicate with our hosts much, especially considering that we had our phones on flight mode (roaming would have cost us a fortune), but our hosts were super quick answering any questions via AirBnB.
Overall I think it was a great choice and we definitely recommend staying there!