The apartment is really nice - it has everything you need for two people for a short stay, very comfortable, smooth check in process, and Sokol was helpful and communicative. It's a comfortable walking distance from the city centre and main attractions.
However, I felt quite uncomfortable in the area after seeing people injecting drugs on the street outside on the first night. That impacted our plans for the rest of our stay by making us get home early and alter our walking routes for the other few nights we stayed. We did not see anything else of concern after that and this may not be a big deal for other visitors. Perhaps we were unlucky. I think it is fair to mention this so that other potential guests can make an informed decision.