Reputable real estate agent for short term rentals in On Nut. Thanks

Read on a post on another group that it's illegal to rent a condo for less than a month and the police are cracking down on it . Anyone know if it's true ?

Also security of entry to an apartment can be risky ?

Good morning folks, I’d appreciate some help regarding a O-A retirement visa. I’m planning to stay in Thailand approximately 9 months so this visa might be my best choice. Even though it’s a 1 year visa, my understanding is that every 90 days I must goto immigration and pay a fee to renew, is this correct? Also, regarding medical insurance, can I buy 90 days at a time since I’ll don’t plan to stay the full year.

Finally, are there any websites for short term apartment rentals other than Airbnb? Probably 3-6 months lease and then monthly.

Thanks in advance.