The flat is really in the centre of the tourist heart of the old town and as you would expect, after getting back from your dinner (typically between 10pm and 12am) you can sit on the balcony and watch the end of the evening go by.
Due to there not being a building directly in front of the appartement building, you have direct vista of the cathedral. Sunday morning Mass is on the hour every hour, so beat the crowds as get into the early one with a stroll around the church when it is empty. Worth doing.
The flat is well equipped and has the facility to do a load of washing for a longer stay. As it is in the hub of the tapas district, your only problem will be too much choice. The ice cream place 10m from the door is the best around.
Don!t be put off by the noise at night, it all gets subdued after midnight - I recommend this appartement highly.