We had a perfect time at the apartment. It is bright an clean.
Yannis responds to every message in no time and is very nice and helpful. The apartment is stocked with everything you could possibly need. A store is right around the corner and if you are going to walk around the city (which I recommend) it takes around 15 min to get downtown.
If you plan on using the couch for a third person you should know, that the street in front of the house is a bit noisy because auf the near by trainstation. If you have no problem sleeping with closed windows you will have no problem.
All in all I could wholeheartedly recommend a stay in Yannis nice apartment. Have fun!