The Good - fantastic location.
The Bad
(1) The claim was made when I booked that check in time is "flexible". This is simply not true. Despite the host claiming "someone will be there" when I arrive at 10am this simply did not happen. The doors were locked and I tried in vain to ring the doorbell/speak to neighbours/knock on the door. I called the host various times but she did not respond to my call. This was shocking and unacceptable. She ended up showing up at 4:30pm. After a transatlantic flight I was exhausted and needed some rest. I also needed to put my bags somewhere. Instead I was exhausted lugging around my heavy luggage all over Zurich for close to 8 hours.
(2) When I was ready to shower in the morning in the room next to mine there was someone sleeping in the same room on the couch. This was both shocking and unacceptable. I obviously refused to shower at that point.
(3) The host asked me to input my personal info into her laptop. This was quite odd. Not sure why she could not do it.
(4) A copy of my passport was left on the desk in the room with the shower. The door was open, as was the main entrance to both my room and bar downstairs. This was both shocking and unacceptable.
(5) Emails were not replied to. I sent 2 emails and never heard back from the host. I cannot understand why this would happen.
(6) The host was not friendly at all. I am not sure whether it was a language barrier or some other reason.

In conclusion, nothing short of a full refund along with many future credits to AIR BNB locations will be acceptable. This experience was the worst accommodations experience I've had in my 30 years of travelling. Ironically when I left to Malta the next day my accommodation experience with booking.com was one of the best accommodation experiences I've ever had. The host was so much friendlier and accommodating than my airbnb host in Zurich.