Joanna's place is very new and secluded in the Alfama area. Joanna is also very nice, helpful and responds promptly to messages. I had a great time staying there!
The only thing is because the flat is in Alfama area so it is not accessible by car, might be tricky if you have a lot of luggages. You will need to go through a flight of stairs before you get to the place. Also the place gets a bit noisy in the afternoon to night.