@Tom121
Some good advice already offered by other Hosts. Most Hosts do offer 20-25% discounts for monthly stays. I would not get pressured by a potential guest to go higher than that, as their are scammers who negotiate a steep discount in exchange for a 3 month stay for example. In reality, they have no intention of staying for 3 months. Remember, Hosts are only paid monthly for long term stays. The guest will simply cancel after one month (at a steep discount), or simply fail to pay and Airbnb will cancel the booking. Meanwhile, your calendar has been blocked for 3 months for this guest; sometimes long in advance of check-in. Cancellations for long-term stays are different than your short term policy.
Long term stays can be an option for Hosts. However, I would thoroughly familiarize yourself with the long term stay policies on each platform before offering them. This will help you avoid some common (and costly) mistakes made by other hosts. Some hosts prefer not to offer long term stays, due to these issues.
Long Term Stay – CAUTIONS
Getting Started with Monthly Stays
https://www.airbnb.com/help/article/2729
Tenant Rights
In most states, if a guest stay is more than 28 days, they are now legally considered a “tenant” and not a guest. If they refuse to leave after their stay, you will have to go through court proceedings to get them evicted.
https://www.airbnb.com/help/article/805
Cancellations
Cancellations for long term stays are differnt than your short term cancellation policy.
https://www.airbnb.com/help/article/475
Guest Reservation Alterations
Guests can alter a long-term stay reservation without Host approval in some circumstances.
https://www.airbnb.com/help/article/1361
Payouts
Payouts for long term stays are different than short-term stays.
https://www.airbnb.com/help/article/285
Price Calculation Errors
Price errors occur more often with long-term stays. This requires the host to verify each one for accuracy (sometimes weekly or other discounts you have set are incorrectly applied to a long term stay).