Maria and Oscars place is right in the heart of the old town. You could not get a better position. It’s tricky getting there by car to drop off luggage. Ask for an easy route or where they can meet you. Parking is a good 15 mins away.(the price of being in a good location).
The apartment is on the 3rd floor and it’s a good 54 step climb.
The area though is amazing and you walk all around the town. The Cathedral and the Jewry are a must and there are lots of great restaurants, tapas bars and coffee shops everywhere.