Helena is one of the nicest host we ever had. She helped us very much throughout our trip: from booking to checkout. We really really recommend staying at this appartment during your Porto trip.
We loved our stay in Helenas appartement - it has everything we needed. It was super clean and comfy. It is not in the city center but we were aware of that and it was no problem at all to get there e. g. by bus (There is a bus station near the appartment, or Uber if necessary).