Nice apartment in a very good location. It is central so it is easy to move around from there and visit all parts of the city. There are many nice restaurants and bars in the area.
We were a couple with a kid and we found the apartment itself clean, nice, and practical in general. It had everything we needed. The check-in and check-out process was clear and easy.
As for the downsides, it is true that the shower is small as others noted but that was not an issue for us. We were a bit sensitive to light at night as the apartment is a bit bright in summer with the type of curtains in place, though that must be general to Stockholm.
We enjoyed our stay overall and we recommend this apartment.