PERFECT, not much else to say. The apartment is amazing, top quality, the best we have seen in Airbnb so far.
The location can't be better, 5-10 minutes walking to old town, Prague castle and all stores. It's located on a side street , so it's really calm.
And the hosts.... BEST hosts you could ever meet. From the very beginning, we arrived very early, they kept our bags so we could take a walk and then come back at the check in time. They also welcomed us with beers and chocolates :-). Furthermore, they kept in touch for anything we could need. Thank you very much Andy&Seb, we will definitely come back again to your place.