Where to place ad for holiday rental in Portugal

[Oceanus]

Hi to all!
Where to start? I used to live in London (back in the day!) but now I'm in Portugal and I have a flat by the beach which I've decided to rent for the holidays. The thing is I know where to place an ad for British rentals but have no idea where Brits go to look for rentals abroad!
When I was in the UK I pretty much always booked with Expedia but they take ages to pay so I was wondering where else people look?
What reputable websites should I look into to place my ad? Tbh I don't want to rent to a bunch of teens holidaying by themselves, so I was wondering where "ordinary" people go?
Thanks in advance for the help!

Air BnB ?

You can set up Airbnb listings so you have to review each booking before you agree to it. Doesn't guarantee that someone wouldn't book for their teenager but should give you some control.

Airbnb

Vrbo

I looked into VRBO which is like Air BnB but it needs a permit which I'm not keen on spending loads on because I'm only renting it for the summer not throughout the year.