The apartment is very close to the central train station, within a short walk, just a few minutes. It's very clean, spacious and warm, which is great considering it was pretty cold outside. The check-in procedure is pretty straightforward, you just need a working internet connection to open the door for the first time. What's more important, you can check-in anytime (in our case, it was in the middle of the night).
The only downside is that it can be pretty noisy outside (trams passing by, drunk people singing, etc.), so I would strongly suggest you to get the ear plugs.