PROs:
The flat is really in a good location. It is very close to the historical city centre. You can go almost everywhere by walking. Even though sound isolation of the flat is not great, it is still in a relatively calm area. So you can have uninterrupted sleep. In my stay, I've also needed to some remote work. During that time, the wifi and internet speed were good enough to do anything I needed to do.
CONs:
There are very basic things are missing in the flat. No trash bins in both floors. Also the toilet paper has probably lowest quality possible. Another thing worth mentioning, the flat does not get a lot of sunlight. So it is a bit dark inside. If you wanna be in a very bright flat, it is not for you. But if you enjoy loomy environment, that is exactly what you need.
Overall, it is a really nice place. The location is simply excellent. I would recommend it if you are planning short/mid term stays.