I had an incredible stay at Rui's place. The flat is contemporary and stylish, with Wi-fi, cable TV, heater / air conditioner and all kitchen utensils one needs for a short stay.
You can see the sun rising from the juliette balcony and enjoy being at the very centre of Lisbon - walking distance from great bars and restaurants. The small touch (a bottle of wine to welcome my stay) was also superb.
Note that there's no lift in the building, so you have to be comfortable using the stairs to get to the flat.
Thank you Brigida and Rui for my lovely time there!