I have been several times in Lisbon before and this was the best apartment and Airbnb experience I ever had. The apartment has been completely renewed and with very good taste in terms of art-decor, and it has everything a guest needs for a comfortable stay.
The flat is equivalent to an upscale hotel suite but with a personal touch (which makes it even better).
The location is excellent, very central but not noisy, right aside St Jorge Castle and very near to others points of interest and restaurants (just up the street).
When I arrived to the apartment I immediately saw a charming basket with some offers from Joao (e.g. portuguese wine, water. bottled milk,..) which is a very nice touch.
The communication with Joao was five stars: he responded to all my questions and gave me lots of nice tips about Lisbon. And Paula is a lovely person that was always available for any needs.
Overall, the relation between cost and quality and guest experience was excellent, I doubt I would find anything better. I'll definitely comeback next year!