Welcome to the forum, Portimao circuit is on my bucket list and Lisbon is an absolutely gorgeous city. I really liked how chilled everyone was and how cosmopolitan the city appeared when we travelled around on public transport and walked everywhere, people we met were always friendly and going out of their way to make sure that you have whatever you needed expecting nothing in return. My wife and I really loved our long weekend there about 3 years ago. I hope it is still the same for years to come.