The apartment is small, of course, but definitively big enough for one person. It is very modern and clean and centrally located in Zürich.
It has most amenities that you will need, however if you need something else, you can simply ask Bandula and he will bring it to you.
Bandula himself is a very nice host, who responds quickly and can adapt to different situations regarding check-in and check-out.
The apartments location in the Gewerbeschule district is very central, so you can easily reach most parts of the city by foot or by tram. However, its proximity to the Langstrasse means that at night, especially on weekends, it can get loud. This of course also means that it is very easy to reach bars from the apartment, if you want to go out for a drink.
All in all it can be said, that the apartment is very good if you are visiting Zürich for a couple of days and need something central to primarily just sleep in.