Take a look at the access provisions of the lease. Your landlord should be able to get in for two reasons: 1) emergencies (let's say a pipe breaks) and 2) to find a renter or a buyer to succeed you after you leave.

#1 is perfectly logical -- if there's a leak, you'd rather the plumber be there!

But for #2, when I am a repping a renter, I try to limit that access to the last 60 days of the lease term, with 24 hours notice. If your lease doesn't have something like that, you might want to write it in.

What's the loophole if you don't? The landlord decides to sell, and then brings buyers through the property three times a week for months -- which can be a disturbance to you as a tenant.