We have tried five Airbnb's in Lisbon so far, and this was by far our favorite.
We loved the paintings in the unit.
The park next door is a marvel and with our dog was a very relaxing experience. People in the neighborhood are very dog friendly.
There is parking in the building, which is absolutely amazing in a crowded neighborhood like Principe Real.
The architecture of the building and unit itself is quite unique blending an old Lisbon facade with more modern loft style interiors. We didn't use the second floor of the unit, and the stairs up were a little tricky.
WiFi was fast but flaps a little bit more than desirable.
All-in-all a great experience! I would highly recommend.