Restaurant/cafe for francesinhas:
Café Santiago
22 205 5797
Google Link: https://g.co/kgs/KZw1q7

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Typical Portuguese restaurants, where Portuguese people have lunch daily due to the low price and quality, of course there are also tourists:
Casa Bragança
22 200 2596
Google Link: https://g.co/kgs/9G73Xj

Cana Verde:
961 346 030 (open only at lunch)
Google Link: https://g.co/kgs/eD8WZg

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A good and tipical restaurant where you'll only find Portuguese people, at an affordable price, but you have to go by Uber, it's about a 40-minute walking. If you think about walking, do it on the way back because it's downhill:
Augusto Restaurante
22 502 0750
Google Link: https://g.co/kgs/EYa26i

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Restaurants to eat good fish, a little away from Porto (Matosinhos, a city next to Porto), you need to go by Uber or metro. Note that in Porto restaurants there are always good options for eating fish, but Matosinhos is a fishing town, so the fish is their specialty:
Restaurante Lage Senhor do Padrão:
229 384 807
Google Link: https://maps.app.goo.gl/sGYKikzyN7v4cRfu6

Restaurant with good food and also has great francesinhas. There are two locations for this restaurant, the first one is difficult to get a seat (you need to book before), the second one is easier;
Brasão da Baixa
934 158 672
Google Link: https://g.co/kgs/9YsxRn

Brasão Coliseu
931 989 364
Google Link: https://g.co/kgs/RBURJr

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Typical Portuguese restaurant, where you can have a light meal with typical Portuguese tapas:
Casa Ribeiro
22 011 9699
Google Link: https://g.co/kgs/yr4mxr

Restaurants to eat fish and shellfish , a little away from Porto (Matosinhos, a city next to Porto), you need to go by Uber or metro. Note that in Porto restaurants there are always good options for eating fish, but Matosinhos is a fishing town, so the fish and shellfish is their specialty:

A Marisqueira de Matosinhos

229 381 763

Google Link: https://maps.app.goo.gl/TpervB7nTQiSVxcq8

Os Lusíadas
229 378 242
Goolge Link:
https://g.co/kgs/3cViqp

Flow

222 054 016

Google Link: https://maps.app.goo.gl/ybojD1ZVzf6GGxC59

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Cantinho do Avillez
223 227 879
Goolge Link: https://maps.app.goo.gl/Ck1Bg8SJfhxbkpEXA

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O Comercial - Palácio da Bolsa

918 838 649

Google Link: https://maps.app.goo.gl/2AJVf4px4Y1xvd3D6