Buying property is already stressful, so at least transportation shouldn't be a problem. The coast around there has some beautiful spots that aren't obvious from maps, and you'll want to check how far your potential house is from the good beaches. You can rent a car in Almada here:
https://getrentacar.com/en-US/portugal/almada . Pick whatever size works for you and your wife, and you can grab it right in the city. Daily rates are fair, and you'll have the freedom to drive down the coast whenever you want to scout the area properly.