Mouzinho 134 is AMAZING! Professionally run by Eugenia and her son Luis, we loved our experience staying in a preserved (but up kept) building in the heart of Porto. Only a block away from Estação São Bento, and about 5-7 min walk from Rio Douro, you can't get a better spot!
The apartment itself is spacious, clean, and tastefully decorated whilst preserving its history. Every morning, we could have fresh bread and pastries hanging from our door. Our personalised welcome included valuable tips and a customised map with key places and restaurants. It was truly another level of professionalism- very B&B-like.
For those with cars/kids, they even offer parking and can arrange babysitting if needed. There's always someone around too in case you need anything.
Best Airbnb experience hands down! Strongly recommend!