The view from the apartment is definitely one of the best you can get in Lisboa! We stayed 5 nights and appreciated the view and the location of the place a lot.
The apartment itself was unfortunately not exactly what we expected. The furniture is really old and gives the place a general worn-out impression. Some things are not in great shape, e.g. loose hooks and the shower door doesn’t close properly so the bathroom is flooded after taking a shower. (We informed our host and hope he’ll fix it for the next guests.)
If you only eat out, you probably won’t mind, but the kitchen lacked some equipment like bowls, cutting boards, bigger knives for slicing bread.
The biggest downside though was the permanent sewer smell which didn’t go away no matter what we tried.
So for us the cost/performance ratio just wasn’t coherent, so we won’t stay there again.