We stayed for one night in Cristina's room. The room itself has a good size and a little balcony to the street. The bed was comfortable and we liked the interior design a lot. In addition to the main room there is a little side room with a desk that we could also use. The flat is really big and has a huge terrace on which you can relax and have your breakfast/lunch/dinner/siesta.
Cristina was very friendly and accommodating and we would always come back for a stay when we are in Lisbon.