My wife, two daughters and I stayed here July 28-Aug 1 2015. The apartment is just as described on airbnb. The view really is amazing! The apartment was clean and everything was maintained well. The area of the apartment, Graca, is charming and has a number of cafes for a quick coffee, beer, snack or full meal within easy walk of the apartment.

Sergio was an excellent host and accommodated our request for an early check-in so we could drop off our luggage when we arrived around 11:30. That first day I managed to lock myself out of the apartment by leaving one of the keys in the lock on the inside of the door. Sergio came responded to my text for help and rushed right over. Seeing that it was going to take a bit of time to fix, he suggested my family and I explore the city a bit and he'd get everything resolved for us and text me when it as all fixed. While I was embarrassed for the error, Sergio was gracious and made sure it didn't ruin our first day.

The only possible downsides for this apartment are:
1) The location is near the top of the highest hills in Lisbon and the apartment is up several flights of stairs. If you're reasonably fit, don't let this stop you from renting here. The views are worth it and Lisbon taxis are very cheap, so you can alway get a ride up the hill if you're tired at the end of a long day. If you have one knee or other health issues, take this under consideration.
2) The mattresses are a bit on the soft side for me and the pillows are a bit flat. This is personal preference and didn't prevent me from getting a good night's sleep, but worth considering if you are particular about such things.