That depends on the circumstances. Do you have any appliances that you need to specifically explain to your guest? Is there something that your guest needs to treat with care or best not use in your apartment? Are there possibly any specific regulations of property management that you must adhere to and should inform your guest of (for example locking of doors, emergency escape routes, access to courtyard or bins, location of smoke detectors or fire extinguishers)? Please make sure that your guest is informed of such characteristics or ensure they can read up on it.