My girlfriend and I had a great time staying in Helia's apartment. Her husband Daniel went out of his way to pick us up at the airport since we were arriving on a late flight, and they gave us metro cards and really helpful maps and tourist materials for the city. The apartment is conveniently located right next to a subway stop, and is right by the first stop of the iconic tram 28. It's also really easy to walk to almost every interesting neighborhood in Lisbon, would highly recommend to anyone visiting the city!