Maria's place is very close to the main attraction of Porto and basically in front of the metro's stop. The house was clean and Maria was on time for the check-in. The house was unfortunately a bit noisy due to the Metro.
There are a small supermarket 2 minutes away from the apartment and an amazing bakery/caffee called Trigo Doce (super recommended).
The only downside was that the toilet had no soap at all (except for some used bar soap) which made our first night (we arrived late in the evening) a bit uncomfortable. Apart from that I would recommend this place to anyone.