I stayed in Peter's room for one month, while I worked at the ETH. I had a very good time at it. The place is in a very good location in Zürich: right in the front of 2 express supermarkets, a pharmacy and a tram stop. There's also a zoo, a fitness center and some cafés and restaurants around. It's very easy to do everything you need walking or by tram. The neightborhood is very quiet and residential as well.
Peter and Engin are excellent hosts. Usually I worked during most of the day, so we did not meet each other often, but they are always available on whatsapp for everything I needed and were extremely helpful. I really appreciated the attention to the details in the room: there were maps of Zürich and general orientations, a coffee machine and kitchen utensils for me to use, a power socket converter, shower items (shampoo, soap...) to use and even a wine bottle opener. Also, the wi-fi worked really well :)
The house is great as well, however, the kitchen is very small. It's alright for cooking practical thinks, though. There is no general heating system in the house though, but the hosts gave me a portable electric heater when I arrived, so it was not an issue.
I must say that I was not satisfied with the cleaning and furniture conditions in the bedroom I stayed (room 6). There were a lot of dust and some spider webs on the corners of the room and of the shelf and specially underneath the bed. The kitchen utensils were not clean to use when I arrived either. Also, the curtains of the bed are very transparent and that makes it hard to sleep during daytime of until later on the weekends. And some pieces of the wooden floor penetrated my feet and hurt it two times while I was walking around.
But, in overall, I had a really good time at this room and would definitely come back.