It is possible to create promotions for up to 7 days but it doesn't seem possible for longer monthly stays. It would be great if booking.com could create such possibility as well.
This is not possible under promotions which only allows discounts for early bookings etc. It is not possible as far as I can see under the current booking.com settings. It is something booking.com should perhaps create, a specific longer term (monthly) letting promotion possibility at discounted pricing. I would also like to include that for my own house.
This is an important topic. The problem at my end is that I do not have 'standard rate' under Extranet - Rates & Availability - then Calendar, so I don't get this option of no arrivals / no departures but I need to have this as well as I want change over days (arrivals / departures) only on Saturdays.