Milton W.
Yelp
TL;DR -- Don't leave Porto without trying Taberna Dos Mercadores! The line and wait is daunting, but you can get in (hints in the longer summary). When you get in, the food is exquisite and you'll leave feeling that it was so worth the wait!
The Longer Version:
First off, thank you to the community of Yelpers who have rated this great LITTLE restaurant and shared their reviews, experiences, and insights. When I first looked for places to eat in Porto, I ran across Tabernas Dos Mercadores. Of course, I flipped through all the pictures first (after seeing the high ratings and relatively high number of ratings). I loved what I saw. I then went on to read the reviews and realized from others' experiences that this place would be tough to get into. So, I was on a mission! I was not going to leave Porto without having a meal here!
I had read that I should go about 30 minutes ahead of opening to start getting in line. One Yelper also said that going at 2:00pm when the lunch crowd dwindles worked for her. So, while in the general area, I went to the restaurant at ~1:50pm on a Thursday (spring season)...there was a substantial line of at least 12 people in front of us (we have a family of 4)--even on a rainy day. We waited and waited...I think one group in this line ended up going in before the staff came out at 2:50pm and said that most of us in line won't get in before they closed lunch service at 3:30pm. But, before we turned away, I asked the waiter what time they opened for dinner. He told me 5:30pm (most think dinner service starts at 7:00pm -- this was KEY for me).
We stayed in the area and toured the Palacio da Bolsa (Stock Exchange), and then I went back to restaurant at 5:00pm and found that I was already 2nd in line. I knocked on the door to tell a staff member that I would wait in line for a table for 4. He told me that without a reservation, I wouldn't be guaranteed a table, but I could wait. On 3/28, the reservation list was already full until the end of April (according to him). At 5:30, they opened! We were in luck and got in!!! There was a party of 3 in front of me, there were two other parties of 2 each behind me that were all in line...we all got in! That was the end of the line (at that point). There were 2 tables already set aside for reservations. Once inside, you could see why there was such a line. This place can only seat 18 people inside its cozy and quaint interior (tiny!). On average, each table turned in about 1.5 hours. So, that's why the line can be so long and not everyone can get in.
While the staff was a little rude when people in line kept asking 'can I get in, when can I get in, is there a table, etc...', once inside, the service was impeccable!
Onto the food...we ordered the Shrimp in Fry Pan, Sea Bass Salt Crusted, Octopus and Its Rice in Oven, and the Seafood Rice. Everything was as delicious as everyone else said, and it was SO WORTH the adventure to get in! I think the best summary of the great food was from my oldest daughter who rarely touches seafood and rarely tries anything new..."daddy, this was a really great meal!"
As we left around 7:00pm and walked out the door, sure enough...there was the LONG line up the hill...at least 20 deep. Don't go around 7:00pm and think you are among the first.