The place is ideally situaded on 'Largo da Graça', which is considered as a '3 stars' spot in all of the french guide books: the view is perfect, either on the streethassle of this very popular area of Lisbon (from the balcony), or on the sunrise above the river (from the kitchen).
Besides, the place is calm, spacious and clean.
For the rest, follow the recommendations of Carlota, they are useful and specific (you may not find them elsewhere!)
Enjoy!