Centrally located, basically on top of a tram stop, lots of room, and clean. There was nothing not to love.
We went for an extended stay --- my wife and me, our two-year old, and my mother -- and the space was enough to fit all four of us comfortably. My wife and I were visiting the universities, which were super accessible, our toddler was visiting the local playgrounds, which were super accessible (although Swiss playgrounds pale in comparison to American playgrounds, tbh), and my mother was visiting shops and cafes and playgrounds, all of which were super accessible.
(side note to those considering a visit with small children: this is a stylish apartment inhabited by a relatively young couple, and it is about as childproof as you can imagine [i.e., not at all]; Maria was not at all bothered when I told her we'd moved and hidden their more fragile trinkets and housewares, but still: you'll need to dedicate a few minutes to getting stuff out of the way; is this a major inconvenience? no.)
The immediate surroundings are quiet, except for the background noise of trams coming and going every five minutes or so, but everything you need is only a 5-10 minute walk away --- or a 3-5 minute tram away. Really it doesn't get any better!