Everything was great! (NB: we got upgraded to the apartment with the park view, so the review is on a different apartment in the same building). Helena greeted us herself and explained what could be worth doing in Porto, was very friendly and helpful. It is a well located and nicely renovated old house, everything was perfect from the lovely and clean staircase (lovely glass rooftop with natural light) to the aprtment itself. The place is spacious, very well furnished and equipped with everything one may need for a longer stay. You can cook a proper meal (oven + stove + big dining table), there was a washing machine, comfortable sofa in the living room. The bedroom had a big bed and huge storage closet. The small balcony has a very nice view to the park and surrounding area. The place is very clean and quiet.
Right outside the apartment on the corner you can find a good local place with tasty pork sandwiches (very popular among locals in the evenings). A supermarket and public transport is close-by, convenient arrival from the train station.
We loved it and would definitely come back if we visited Porto again. Highly recommended!