The flat is in perfect condition and equipped with everything you need. Some neat highlights were that it offers blazing fast Wifi (>500Mbit/s), an induction stove, a kitchen mixer and two large tables that are ample for every group of six.
It has three double-bed bedrooms that are in great condition and offer enough closet space for every guest. The kitchen is well-equipped with everything necessary.
Apart from that, the apartment is located in a quiet street yet not far from the tourist hotspots and the coast. We could easily reach everything we wanted to see by foot (<45 min walk to about every part of the city).
Additionally, Johan was a kind and communicative host. Upon request, he equipped us with additional covers for the double bed (instead of sharing one). Checkin and checkout were a breeze; Johan welcomed us at the apartment upon arrival and we scheduled a good time for checkout just before we had to leave the apartment for our flight.
The only minor thing that was disturbing at times were the top neighbors' small kids which we could sometimes hear throughout the night through the rather thin walls. However, this was not on a regular basis and I think that future guests might not encounter the same thing.
All in all I can recommend Johan's apartment without reservation. He is a great host with a perfect apartment that is great even for larger groups of guests. Thank you, Johan!