We enjoyed our stay of one week. The location is in the castle neighborhood and near good restaurants and cafes. We walked almost everywhere, only taking a taxi one time to get home late at night. Most days and nights we walked to get a good feel for the neighbrhoods. The historic E28 and E12 trams both come close to the apartment so that is a fun and efficient way to get home and all over the historic parts of the city if you don't want to walk. But it is best to buy a 24h metro card rather than pay each trip.
The apartment was spacious and had wonderful air flowing through it so we did not need an air conditioner much. When we did need the air conditioner it worked very well.
We didn't cook but the kitchen is fully equipped.
The one full bed and two twin beds were comfortable and we slept well.
The only annoying thing about the apartment was the noise from neighbors above. The ceiling is thin and furniture, rolling luggage and voices all come through the ceiling quite loudly. This isn't a problem unless the group above is loud late into the night which we experienced on several ocassions. Hopefully the hosts can address this issue and it won't be a problem for you.
Check in was easy. Communication was good. A maintenance issue was addressed promptly. We were happy we chose this apartment and we had an excellent opportunity to get to know the neighborhood and the city.