I stayed four days in Ricardo and Maria's apartment and I would highly recommend staying there. The apartment was super clean, has a modern look and had all necessary amenities. The apartment is only a three minute walk away from the metro. Also very close to downtown areas. Maria is such a friendly host and made me feel welcome right from the start. Plus she helped me find my way around Lisbon and was helpful all along. I would love to come back and stay with her the next time I'm in Lisbon!