Tremendous communication! I received a WhatsApp from the Your Opo Apartments team several days before check in and they continued to offer responsive support and information throughout our stay. They also provided the most informative check-in, with useful tips and great inside information to prepare for our stay. The apartment was also in the perfect location adjacent to the main walking street.
However, one note for those intending to prepare meals is that the kitchen was quite thinly stocked compared to other Airbnbs we've stayed in. There were no condiments (salt/pepper), no accessible cleaning supplies like a broom, a non-functioning coffee maker, only one washing tablet for a four day stay, and limited trash bags. There was thankfully a very well stocked grocery store less than five minutes away and wonderful food options at reasonable prices all around, so no major impact overall.
Porto is a great city and this was a perfect base of exploration!