First of all, if you want an easy and quick check-in process this is not the place for you. Going to the "welcome center" in a totally different part of the city added an hour to when we would have arrived at the place. Every other Air Bnb we stayed at in Portugal had an extremely simple lockbox to get our keys. This place is not worth the headache of the check-in process.
The view was amazing but that's about it. And there's a ton of incredible viewpoints throughout the city, so it's not like you won't get to see amazing views throughout the day as you explore Lisbon. The bathroom was not clean, the shower had leftover hairs and the "clean" bath towel was stored under the toilet seat... Overall the place was dirtier than most places we stayed, even the 2-3 star motels. Seems like this place would be best for someone who wants to go out to the bars every night, but not for folks like us to who appreciate a little more comfort and quiet at the end of the day.