Very good spacious family stay-oriented apartments. We (4 persons) spent 8 nights and were happy every day. Margarita responded to all messegen in system instantaneously, arranged an easy check-in even at 1: AM (our flight was late). The apartment is not luxurious or somehow extraordinary, just a good two-bedroom, dining room and full kitchen flat with a big terrace and balcony. The kitchen and rooms are fully equipped like at home, just no dishwasher machine, which is not a problem for holidays.
The apartment is on the 3rd floor and no elevator is available, therefore people with limited mobility and with strollers/bikes have to take into account this.
No air conditioning was available, but during our stay with temperatures (27/18 deg. C) it was not a problem, open windows were sufficient.
The apartment is located in a slightly remote area from Old Town or Beach, therefore public transport (buses) or taxis/Uber have to be relied on. Metro stop is ~1.5 km away, therefore buses are more convenient. We found out that buses go according to schedule on work days but are somehow tricky on weekends. We do recommend PortoCard for intense exploring of the city since 2-Eur tickets for each lift turns out to be quite costly at the end of the day. Some grocery shops and local coffees are located within walking distance.
The outdoors near the apartment were not too quiet at night time as could be expected. But this is probably the matter of Porto/Portugal in general and not specific to the current place. The airport is pretty close (10 min ride by Uber for ~13 EUR), but landing and taking-off planes can be heard even at eraly/late times. It seems that nobody outside is going to sleep before Midnight. But one day the waste management company decided to dispose containers (especialy glass) at 3 am.
To conclude: Margarita's Apartment is very good value for the money asked.