I was able to find Cristina’s place on short notice due to some changes during my trip - I was so thankful that I did! Cristina’s place is extremely clean, matches the description and perfect for one person or a couple. I received prompt communication throughout as well which was great. 10-12 min walk from Marquês de Pombal as well, so you’re very central.
As per some reviews, you can indeed hear the neighbours walking up and down the stairs but as long as you’re not a light sleeper, this should not be a problem!