We stayed at Ester's for a month with my husband and our 4year old daughter. The house was perfectly clean and she even did a grocery for us. we felt very welcomed. We had some problem with the ceiling but Ester did everything to solve the issue as soon as possible.
It was quite cold and humid in the house as November is rainy season(It rained heavily for 3weeks!). So we made fire almost everyday during our stay.
Porto is small city. I paid 10-15euro when I use Uber to get home from the center.