I would say maybe about as common as in The Netherlands. So it's definitely not at a Bali level, but you can there are still plenty of them.

I didn't buy or long-term-rent one myself, but used https://whizascoot.mt/ and https://gotoglobal.com/en/goto-malta/ and I would buy one over a car. Traffic and parking can be bad, and scooters really help out there. And the fastest you can go on any road is 80km/h, so you can get everywhere by scooter. (the ride sharing ones are limited to 50km/h, so roads with a higher maximum speed are not ideal)