I totally recommend Lusa School. I'm Spanish. I did not know Portuguese at all and end up being able to have a basic conversation in just 2 weeks of intensive summer course, thanks to Ana!
The staff in the school is very helpful and flexible, which makes your stay very comfortable 🙂
About the residence, I recommend the one in Chiado. Even it's older than the other one, it's very well situated if you are new in the city. I went everywhere by walk. It's clean and if yiu ask for a room that does not face the street, you will sleep as a baby (just keep in mind you won't have nice views).
Thank you for everything and see you next time! It was just perfect 🙂