The world is on High Alert in this time and age. If the hotel has a luggage storage service, then they should have precautions of having the correct identification to match the name on the luggage. I agree with the people who answered previously: 1. Travel light. This hotel has laundry service, or if you prefer, there are laundromats within a block away from the hotel. Laundromats are good places to meet locales. 2. This hotel knows the answer to your question. "Contact the hotel directly" is not the answer you want, because you're already "googling," "yahooing" or "search engineering" AC Sants, but honestly, they will give you the best answers. The property manager occasionally reads Tripadvisor. They might answer your question here. 3. If you really want to bring your suitcase. Airport or Train Stations have lockers you can rent. From what people say, it's insured. There may be some liability involved for hotels to keep luggage. What do you think will happen if it gets lost, or if there's some contraband, or something that goes KABOOM? I would not want to place that burden on anyone to watch my luggage unless there's a guarantee. Like the three people who answered your question before me, they're all wishing you a successful trip and enjoyable vacation. Bon Voyage!

We just stayed there last month and have the exact same status as you. We were upgraded to a superior room. They do not offer free breakfast but they did give us a welcome gift credit that we could use towards breakfast.

It is! Not difficult and there is main station "Sants" just nearby hotel.