Daniel's apartment is perfectly located! It is within 15 min walk to major attractions. There are a lot of great cafes and pastry shops around. If you want to have a great night out - this is also literally within Barrio Alto - the main area with outdoor parties and bars after bars. We enjoyed sitting on the balcony drinking some ginga and enjoying the night/life from up top. However - it is loud at night until about 3/4am. If you are a light sleeper, bring ear plugs.
If you need a place to leave your luggage after check-out/before your flight, there is a shop right next door called the Blue Shop which has luggage lockers for the day at a cost of 5-8 euros - depending on the size of your luggage.