The apartment is beautiful, perfectly located in one of the best area of Lisbona.
Is very big especially the living room, both sides of the house have beautiful views and it was very clean.
It is very close to Principe Real, an area with nice shops and restaurants, but the apartment is also very quiet.
The check in at the visitor center was easy, if you have luggage I recommend to call a Taxy to reach the apartment from the visitor center, it takes only 5 min, but you avoid walking on very steep streets.
I recommend staying there.