"Inexpensive quiet apartment, right at a tram stop,"
If you want a "hotel" (front desk, room service, dining room, a spa), this is not for you. If you want an inexpensive apartment that is convenient, spotless, quiet and up-to-date, then I honestly recommend the Seestrasse Drei Koenig. It is *not* luxurious, it is a generic Swiss apartment (and is a short walk from the hotel with which it is affiliated). If you spend your days or nights watching TV and/or lounging about, eating in the hotel restaurant, then this is not for you. If, on the other hand, you sleep in your room and are out during the day, this is great (and you can cook your own dinner in your room if you like(. I have stayed here on 4 separate trips, and it is my go-to location in Zurich. The B2 is modern and upscale, the Engimatt is less modern and also very nice, and the Sihlcity hotel is a hotel - and all are *much* more expensive and offer amenities that I don't need on a working trip. The Drei Koenig Apartments is good quality, solid, no-nonsense, preiswert and perfect for my needs.
Traveller from Pittsburgh PA