The flat is located in the first floor of the building. You can either take the stair or the lift (for your luggage). Picking up the keys were easy as we were there during office hours. We just had a difficult time finding a place to bring down our luggage from the car since there was no drop off area in front of the building. You can either park the car or quickly stop in front of the building (which is what we did).
All the facilities and amenities of the flat is as described. We were a group of 6 friends who stayed there for a wedding in Maria Cristina. The place feels very cozy with the paintings on the walls. All appliances were working. We were able to use the stove, dishwasher, refrigirator, washing machine, iron, and microwave.
Host was able to respond quickly to our inquiry regarding the stove not working properly. We needed a different set of pans to use the stove.
Our stay has been so comfortable. Location is perfect. Would definitely stay there again given the chance to visit San Sebastian again!