I loved my stay at Luster Hotel, I was staying alone and all of the staff made me feel really comfortable. They gave me suggestions of things to do and places to go to explore the city which I appreciated.
I took a trip to the spa for a massage, which I would highly recommend because it was super relaxing and worth every penny!
The pool area can get quite busy and not all of the sun loungers get very good sun exposure during the day but I think that this is because of the big buildings that surround the hotel and can't be prevented.
Also, the hotel is really close to a metro station which makes it very easy to get into the centre of Lisbon but if you want to stay somewhere which is walkable to the main districts, it might be a bit of the way out. I primarily took taxis, which are really cheap, but you do lose out on walking around the streets and seeing the magic of the City.