@Matthew-And-Sherne0
We do this all the time for guests - setting the scene in advance helps. So we say, by all means come at 8am, your room won't be ready, but you can pick up a key and start exploring the city. Likewise on the last day, they know they need to check out and remove their bags from the bedroom to the hall by 11am, and they can come back when they need to, pick up their cases and head home. Guests like this, but whether or not you can offer it is the question. Do you have a place where guests can leave their luggage? We also offer them use of a bathroom - not to shower but just freshen up etc.
Put yourself in the guests shoes - if you were going somewhere for a few days and arriving early, you would probably ask the host if you could drop off bags. If the host said no...how would you feel.
There is of course an alternative that may be available to you - is there any left luggage facilities near by? If so, then in your description and communication with the guests you can highlight this.