I have stayed in arbnbs in Canada, United States and Europe. This particular unit is well below the standards I have come to expect.
Cons : As mentioned in other reviews the lighting in the stairway is very dangerous. You walk in complete darkness at night. Many lights do not work in apartment. The shower head was broken in the main bathroom. Two toilet seats are broken as well. The main door is almost impossible to open without pushing with your shoulder. The worst part was the odour of cat urine and mildew. There are 3 feral cats living in the courtyard. The courtyard is dirty and unsanitary as the cats deficate and urinate in the courtyard. This smell is throughout the unit. You cannot leave the windows open during the day or night or the cats will come in. I realize it is an old building and do not expect perfection but these problems were unacceptable.
Pros: Sarah , our host at the Vinofino was very kind and hospitable but could not resolve any of our issues. The unit is in an excellent location, close to everything in main part of Porto. However, the cons completely outweigh the pros. I would advise you to look elsewhere. You deserve better than this when you travel.