The food, service and the atmosphere at this tiny place deserve the rave reviews that they have been getting, so let me add just one little bit off advice. If you have not booked a place, do not hang your head and cry when you look through the window and see little 'Reservado' signs on all the empty tables. We went in at 7:00pm, despite the obviously booked-up nature of things, and were told that we could stay and eat if we were sure that we would be out by 9:00pm (!). Personally I think it is a bit silly of the management to put those 'Reservado' signs on the tables, for it tends to keep the tables empty for far longer than necessary. This is a place for lovely light meals, quickly prepared. Even at a leisurely pace you need nothing like two hours for a few plates of Portuguese Tapas and a bottle of wine.
This is a perfect place to go after the 'Fado ao Central' performance, by the way, which ends at about 7:00pm and is just 150 to 200 yards away. Fado at 6:00, Fangas at 7:00, and perhaps some more Fado (starting around 9:30) at the fantastic cafe adjoining the old church in the centre would be a perfect evening. That fantastic cafe--the Cafe Santa Cruz--is in a huge side chapel with groin vaulting, elaborate bosses on the ceiling, gargoyle-like creatures of stone, etc.
If you own or manage Fangas Mercearia Bar, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.