Corinthia Lisbon Hotel
It's not in the center, but I don't care because it's next to the subway that takes you to several stops in downtown Lisbon. It's a 5 star hotel in an elitist chain that provides quality accommodation. The restaurant is great and you can choose to have a buffet. The breakfast buffet is the best we've ever had. Pool, cafe, pub, the hotel is almost directly across from a shopping center, and, occasionally, it throws some some very affordable offers your way (that's where to go to take advantage of this hotel that would otherwise be too pricey). To unwind after a day in Lisbon.