Maria is a great host and we had a very good time staying at Maria's place. Apart from amazing hospitality on Maria's side, the apartment is very conveniently located, within walking distance to many tourist attractions and very good restaurants. We were planning on buying a multi-day travel card for our stay in Porto but it wasn't needed at all. The only trip we made was on a tram to the seafront, for which a separate ticket is required anyway. I highly recommend Maria's place!