@Dawn1129
A typical discount for a monthy stay is 20%
If you are going to accept monthly stays, I would turn OFF Instant Book for sure. Not only will you be able to better screen guests, you can control how many days your mid term bookings will be. If a guests requests to book 28 days, explain it would be better to book 31 days to avoid the TOT tax being applied to their reservation (the guest should be paying the TOT, not you). The guest should pay you, and then you remit the tax to the governmental taxing authority.
If they still only want 28 days, then send a special offer which includes the amount for the entire stay (include your cleaning fee and TOT in the total). Be careful to get the math correct.