Hi @CNUGENT1 Thanks for your question!
We’ve checked in with Glenda Cole, our expert in Portugal, to get an answer to your question. Here is her response,
First, that type of renting is called long let. When searching, enter "long lets in _____". Idealista.com is a great site for both buying and renting, but it can be difficult to find just a month or two there. If you have a general idea of what area you would like to explore, you can look for long let companies in that area. Typically, going local can save you money. For example, I rent my villa near the sea in the Algarve in July and August. You can find it on Air BnB, but you would save quite a bit by going through my local management company, Luz Villa Rentals.
Before I bought, I used to rent in the western Algarve for three months in the winters. I used two companies: Lagos Long Lets and Coolhouses Algarve. Both were good.