Yeah Booking.com is a good go-to also. Compare prices.
As for destinations, I have noticed they have all been getting more experience, both due to the weather but also post-lockdowns, everyone is out and about.
Central/Eastern Europe is my personal favourite. Krakow, Poland (amazing). Belgrade, Zagreb, Kotor Montenegro.
Off topic, but any interesting destinations that had reasonable AirBNB's that you want to share? :)
I plan to do something similar this year, hopefully.. wondering where to go, though.