If a listing is visible on Neighbor's search pages, then the storage space is currently available. Additional time restrictions may be listed in the space description.
Potential renters can also message the host before making a reservation to ensure the listing details have not changed and to make sure it is a good fit for both parties. Specific questions about the space can be addressed through messages.
To message a host before placing a reservation, see Can I talk to the host before reserving the space?