Overall we really liked the location of this unit, you're in a bit of a "touristy" spot but for a short trip to Lisbon it's a great location and very central to shops, restaurants, bars, and other attractions.
The unit is very modern, with a great view.
I gave a 4 star instead of a 5 because there are a few things I suggest the owners include to make it worth what they are charging (all very easily doable).
Including things like coffee for the Nespresso, hand soaps in all bathrooms, laundry detergent, etc is a great way to make the stay 5/5.
The only other comment is we had trouble on arrival, our flight was cancelled the night before and we arrived the next day, very exhausted. The front desk did not have a key to the unit but made a call, and within ~15-20 mins someone arrived to let us in. They were apologetic, but not the smoothest way to start the trip.
Overall the location is perfect, the unit is modern and I'd recommend staying here for a trip to Lisbon!