We stayed a week at Luis' place, and it was a perfect spot for visiting Lisbon. It's close to the Metro for getting around the city, but also close to Parque Eduardo VII park for a relaxing walk, coffee, and pastel. Shopping and grocery stores were also very close (10 min walks)
The apartment looks just like the photos - very cool and artsy decorations. Communication with Luis was great. He even provided a recommendation for a hair salon for my traveling companion from his sister. Internet/TV was good.
Would definitely recommend his place and would stay there again on another visit. Obrigado, Luis!