Our stay at Luis' Barrio Alto apartment was phenomenal overall. The apartment itself is incredibly nice: spacious, well-kept, and well-furnished and decorated. We were very comfortable there with a group of 7 and had two keys such that groups could split up to do different activities throughout the day.
The apartment is situated very nicely in Barrio Alto, which makes it very convenient to the Rossio train station, the tourist activities in Baixa/Chiado, and a host of excellent restaurants, bars, cafes, and other amenities. It was easy and affordable to take a taxi/Uber between the apartment and the airport as well as the Belem district (everywhere else we were able to walk!). The only minor negative was that the side streets in Barrio Alto, including the street on which the apartment is located, are frequented by slightly "less than savory" characters in the evenings, and we were offered drugs on more than one occasion; notably, we never felt unsafe around the apartment, just moderately uncomfortable at first. That being said, the location was otherwise ideal!
As a host, Luis and his team are incredible. He was prompt and professional in our communications (even in my last minute messages the day of check-in). Luis provided printable instructions for our taxi driver from airport, and we were met in person by a member of his team (Thiago) who showed us around the apartment and ensured that we were comfortable. Thiago even provided recommendations for restaurants and bars in the neighborhood as well as seating suggestions for several of our group members who were attending a Benefica game.
Overall, we were thrilled with our experience here. I would recommend this apartment, and if I were to return, I would consider staying here again. Thank you, Luis, for a phenomenal stay.