All in all I had a great stay in the apartment. The neighbourhood is really lively with many cafés and bars (sometimes it’s loud at night, but that didn’t bother me). You can reach all the main sites by walking, the apartment was clean and is very suitable for long-term stays!
Only thing that didn’t work out well was the wifi with which there were some struggles, because the connection didn’t work all the time. But Nikoletta brought me a new SIM card, so I was able to make a hotspot for my laptop. :)