I had a fantastic time, this apartment is amazing. It's hard to capture the space because the studio's main charm is the white walls and their impact on light. It's impeccably executed. Specific notes below, but I highly recommend this place.
1) The hosts: Matt and Max are attentive, nice, and welcoming. They replied to inquiries quickly, were in-tune with our needs, and made sure we were comfortable. Fantastic.
2) The studio: this is a cozy studio, definitely fit for no more than a couple (comfortably). The space is very well-utilized, the view is great, and the decor is new. I'd like to highlight the incredible eye to design Matt and Max had. During the day, when it's lit, there are many windows and doors that open to let the light in. I mean with white walls, the place feels peaceful and open. At night, all windows and doors can be completely closed and not one ray of light comes in. It's a complete shift of experience, incredibly private, dark, and cozy. I can't tell you how special it felt.
3) The premises. If you are looking for Port wine, this is a great location. Walk down a few blocks and you are near the major Port wineries around, no need for cabs, etc. We did not mind walking to Porto itself, on the other side of the river, and specifically looked for the Vila Nova de Gaia neighborhood. Note that Porto is hilly, with narrow streets, so getting around in a car can be a challenge. In any event, I got around just fine.
4) The town. Porto is great, I would recommend no less than 3 nights, probably more if you are looking to experiencing the beaches and local restaurant scene. Matt and Max know the entire place, have restaurant recommendations (the local market is the best he made to us). Make sure to pack comfortable shoes and carry cash.
5) Other--if this matters to you, I am a gay man and traveled with my husband. We felt completely welcomed by Matt and Max and would (likely will) come back.