You have various options when it comes to getting the keys to guests. Some owners choose to use a meet and greet service. You could ask a friend or neighbour to do this or employ a professional agency. If you opt for this, make sure both your representative and your guests have each other's phone numbers in case of delays or problems.
Other owners send the keys to their guests before their departure. If you choose this option you need to leave enough time to allow for postage, especially if you or your guests live abroad. You then return their deposit once the keys have been returned.
Alternatively, you could use a fixed position key safe with a reprogrammable combination lock. You can check this website: click here