The flat is great and the view over Lisbon is great.
The area is very busy at night, so you will be in the hot spot.
Flip side is that it can be very noisy, if you close the windows you will hear not a lot anymore.
We haven’t used the grill.
The staircase is very steep and narrows going up, so we recommend not to have big and heavy suitcases.
The place is nice for a couple of days, as the beds are comfortable but not that wide and you only have three showers and 4 toilets.
The apartment is definitely a recommendation and you are close to all famous sightseeing spots.
Go there!