Our stay was great. Frank has put a lot of care in the apartment, and it shows. It was very clean and is full of useful things (e.g. HDMI cable for the TV, additional power strips), has a very functional kitchen, and is well thought out.
Having two washing machines and a drying rack is always extremely helpful for long stays or when in the middle of a long trip, so that is a big plus too.
The neighborhood is also very nice - safe, silent, with some great restaurants nearby, and with easy access to both tram lines and underground.