As this apartment is organised professionally, we didn't see Susete & Osvaldo. There is a host at the entrance who takes care for your whole safety 24/7 and shows you the flat. In any case you can reach him by mobile.
We had a great time in the heart of Porto. From the flat you can reach everything by foot. The street in the front of the house is very busy during the day.....lot's of shops, coffee shops and many tourists. At night.... it is getting quiet and everyone get's his beauty rest :)
If you want to see the city by public transport... you will get to the next station just around the corner.
We had a good time at the apartment and the price is definitely worth it.