My sister and I have stayed in Sonia's apartment for 2 nights during our trip to Porto.
Below are the positive point about our stay as well as an issue that we have had.
The Positives:
1. Apartments is big and clean.
2. It is conveniently located, close to the Metro station an to the city center.
3. There is big, comfortable car parking on premises.
4. Sonia was very responsible when we had a small issue with the bathroom sinks. The issue was resolved very quickly.
5. Our flight from Porto was later in the evening and Sonia was very nice to let us check out of the apartment an hour later.
The checking-in issue:
We called Sonia a day before our arrival to Porto to let her know that we will be coming to the appointment late in the evening the next day and to get instructions on how to check-in.
Sonia asked us to call her 30 minutes before our arrival.
The next day we were driving from Lisbon to Porto. We called Sonia about 5 times between the hours of 7 and 10 pm and did get any response.
We checked an email in 7pm and found an email from Sonia sent from Airbnb at 18:34 where she was asking us to come to her house to pick up the apartment's keys. We sent her SMS, that we will do that and asked for her house's address. After that we did not get any response from Sonia until we actually arrived to the apartment at 10:15 pm. At that time Sonia called us and sent the address of her house.
It took us additional 1.5 hour to go there, meet Sonia, get all the instructions, drive back and finally get into the apartment.
This was rather unpleasant experience after 4 hours drive from Lisbon.
One more, hopfuly, temporary problem. Some distant neighbour started consruction at 9am both morning and woke me up. Earplugs were solution for it.
Still, overall, our stay in Sonia's apartment was pretty good and we enjoyed our time in Porto.