The apartment is easily reached by the 602 or 601 bus (costs €1.90 and leaves every half hour from the airport, right outside arrivals). The journey takes about 45 minutes and the apartment is a few minutes walk away. There are only cobblestones so be aware of heavy luggage and the wheels.
The late night, street, foot traffic is rowdy and off-the-charts loud (up till 3.30am on a Thursday AND Friday evening) so ask for a room NOT facing the street "Rua de Tras" (the noise, as well as the motion sensor street light kept me awake for hours on both nights).
The amenities are clean, albeit spartan. Take your own docking station for music (if that's important to you). The location is central to everything so very convenient.
The shower is great with good pressure and heat.
Towelling and bedding is basic and clean. There were great touches like a blender, coffee machine, hairdryer, microwave and fridge.
The room is tiny (I was staying alone) so I believe it is suitable for a single person only...