The communication with Concpecio and the check-in worked perfectly and everything went smoothly. The flat itself is clean, well equipped and in a very nice location! What was particularly positive was that the kitchen was well enough equipped to cook something small, meaning there is more than just one pot and one pan.
You can get from the flat to various nice bays quickly by car and have everything you need in the close surrounding (e.g. several supermarkets). All in all, a recommendation for a stay with two people :)