There are a couple of hotel options in Sines, but the Dom Vasco is arguably of the highest quality. The small boutique style hotel has only about ~12 rooms. But they are all extremely comfortable and equipped with the highest amenities. It is a bit expensive, but I have to admit I was very pleased.
Unique Quality: Breakfast is included. WiFi is included.
Every room has a PlayStation 3. Games and movies are available at the front desk for free.
There are two outdoor heated pools (good for relaxing, not swimming).
There is a small workout/gymnasium.
Directions: On the west side of town, near the water tower
Rua do Parque, N0 13, Apartado 273, Sines
Rua Marques de Pombal, 110, (Formerly "Sinerama"), Sines
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Address: Rua do Parque, N0 13, Apartado 273, Sines, 7520-202, Portugal