I would say it was the best place I stayed in Porto so far. View from the window at Praça da Republica and lots of sun even in winter makes for a good start of the day. It's very well located, within the walking distance of city center and Trinidade metro station is 5 minutes walk away if you need to get somewhere further. There's a grocery story open every day, nice cafes and my favourite part of the city - Cedofeita - id very close.
The apartment itself was very clean, with well equipped kitchen. The heating worked perfectly. Eliana was very communicative and helpful, I really enjoyed my stay. Highly recommended if you plan to visit Porto. Thank you guys!