Where can I leave my luggage before check-in or after check-out?

Feel free to ask your House Angel if you need to store your luggage; depending on the schedule, they might let you leave your luggage inside the house before you check-in, even if the cleaning is not yet finished.
If not, you can always use the paid coin lockers available at most train stations. They offer storage for various sizes and you can leave your luggage there until check-in time.

After check-out, you will have to use the coin lockers as you cannot leave your luggage in the house once you have left the keys for the next guests.