Read check-in and check-out instructions carefully. The office is 15 minutes away by metro/10 by taxi but you must go to their office for checking in and out ... no exceptions. Add this time to your agenda because it will take about 45 minutes to check-in and quicker to check-out but if you are trying to catch a plane with a large group ... beware! I had not been aware of this and it significantly impacted our time in Barcelona. It would be much better if somehow a keypad or some other means could allow you to check-in at the apartment, or at least have someone meet you there instead of making the guest come to the office. Also check-out should just be leaving the keys in the apartment on the way out instead of making me return them to the office before leaving - very inconvenient.