We had a perfect stay in Lisbon, the Apartment is spacious, clean and there is everything you could wish for :)
Joana is an amazing host, she answered all our questions quick and in a helpful way, whatever it was. (btw, it is worth the way walking to "A Padaria Portuguesa" every morning for the portuguese croissant :D )
Also, Lisbon is a wonderful city, go there and stay with Joana!