I have enjoyed spending only one night at Sofia's. The apartment is small, yet the room is very clean and quite spacious. A private bathroom is inside the room (which is nice)! It's very cozy and quaint. The location of the building from the train station and the city center and all the attractions is perfect. I'd definitely recommend it for those who plan to visit Zurich for sightseeing and not to stay the whole day in the room.
Sofia and her partner are extremely hospitable and nice. I've enjoyed chatting with them, and I wish in the future we'd meet again.
In conclusion, a great experience in Sofia's place and would definitely stay there again next time I visit Zurich.