Excellent location, It's in a small, charming, 15th century neighborhood of narrow cobblestone streets and mosaic tiles called Madragoa. The locals are colorful and a true slice of old Lisboa - reminding me a bit of life in the Quartieri Spagnoli in Napoli, Italy: they might come on a bit strong for some, but they really give you a sense of place and rich family history. There are plenty of great restaurants nearby, and the river and much of the center of town is a pleasant, short walk away.
The apartment is clean and recently remodeled. While it might not seem like much space given its 15th century quarters, I found it perfectly comfortable for the 2+ months I stayed here. The Internet connection sometimes had occasional hiccups with video calls, and hopefully you're not in Madragoa to watch Netflix, but some guests might have higher bandwidth needs than the network can fully handle. Marisa did seek ways of helping when there were issues, however.
She is an excellent host. She didn't need any prompting to recognize that I was a longer stay with a bit more than the weekender's luggage, and thus she brought in a dresser and other amenities to improve the comfort for my stay. Great communication and coordination too.