I recommend staying at Sevi's flat in Zürich without reservation. He provided me with all the relevant information I needed for my stay.
The flat is clean and contains the requisite essentials for modern living (e.g., comfortable bed, fast Wi-fi, maps, clean sheets and towels, and the like). The room is also spacious.
The location is ideal. Easy to get around with public transportation and walking distance to great sights and restaurants. I had a wonderful stay and tremendous experience!