We were in Lisbon for three days, and found Marta's place to be an excellent base from which to explore. The location is fantastic; excellent from which to walk around to a lot of tourist spots, but also super close to the Metro.
It's a small apartment, but had everything we needed for a short stay. Communication was quick and easy. Marta organized to meet us at the apartment when we checked in, and communicates via email or SMS, though prefers WhatsApp.
Overall, definitely a good experience and would stay here again.