@Fiona259
You do not offer a serviced apartment, so as far as cleaning goes it is normally up to the guest. That said, the guest might expect a different approach, so I suggest you discuss with them. Some guests would not want the host to enter the apartment while staying, others would welcome a weekly cleaning. Getting into the apartment on a weekly basis will also allow you to check that everything is running smoothly and guests are behaving.
It also depends on how the apartment is set up. If there is a washing machine they could do their own towels and linen if you provide double sets. Or you can agree on a linen and towel exchange at suitable intervals.