We stayed at this apartment with two couples for an extended weekend. Over all it was ok, but there are also a couple of improvements to be made.
The apartment wasn't cleaned properly, for example: long black hairs on the bathroom floor and on the towels. Used shampoo bottles were left behind, in the shower. Only 1 tea towel in the kitchen to dry your hands and dishes, etc. Furthermore, it would've been nice if we had more than one set of keys, especially if you rent it for more than 2 persons.
Because of the lay-out of the apartment, one of the beds is placed in the landing of the second floor. If you value your privacy, bear that in mind while booking the apartment.
The apartment was in a quiet neighbourhood, but with a lot of supermarkets, restaurants and bakeries. Communication with Karen is very smooth and she gave some tips for our stay.