Check grout in bathrooms, kitchen, etc.; repair as needed.
This will prolong the life of your tiled surfaces and just looks better.
Inspect plumbing for leaks, clean aerators on faucets.
Go around to all your faucets and toilets and check for any small leaks. If you have poor water pressure out of a faucet, the aerator is the likely culprit and it’s an extremely easy fix.
Take care of any insect problems you may have.
You probably won’t have to look too hard to notice any insect problems. Ants, spiders, moths, etc. are all common, and fairly easy to take care of. Keep cobwebs clear, have ant poison handy, make sure all doors are tightly closed, etc. If termites are common in your area I would recommend you do an inspection.
Clean the balcony as needed.
It generally just needs a good washing. Also, check the handrail to make sure nothing is loose.
Clean all windows.
Also, check the caulking around to verify it is in good condition and there are no risks of water leaks.