This apartment, its location, and its view is outstanding. We cannot recommend it enough. It's located in Alfama but extremely close to Barrio Alto and the water, so walking to different neighborhoods is a breeze. The apartment was the perfect size for 2 people. We loved sitting on the balcony to enjoy the sun set over the Tagus River with cold cans of Sagres. This apartment was the icing on the cake for our week in Lisbon.
Our only note for future guests is that it is a six-story walk-up apartment without a lift, but that shouldn't be a problem if you're already spending your days hiking over Lisbon's (very) steep hills. I would advise against this space if you have any disabilities that limit your ability to climb stairs.