If it's two years or more and/if it needs painting, yes. I would expect it if I was moving into a rental unit it would be fresh and clean. I think a reasonable landlord would not request spackling but to tell the new tenants no barn nails in the wall! Hanging pictures today, you use picture hangers that leave only tiny holes-no biggie to fix. If they are planning to hang a TV or something with weight, then permission should be necessary, that way you can be certain the proper anchors are use.
We rented out a townhome for several years, had two good tenants and two not so good. We always painted, but the last tenants were having a baby so we allowed them to paint and we put down new carpeting in the baby's room.