I recommend Lisbon because is the capital, and you also have nice beaches there and many good spots to absorb the culture (one of my fav spots is a chill bar with a lot of vintages collection on the walls called “pavilhao chines“ to enter you have to ring the bell or wait for someone to come out) if you had more time I would also recommend Porto (is where I’m from) it has a lot of beautiful spots as well!
