Nice spot -- even though it's a bit of a trek to the city centre, there's still some stuff to see in the area (including the Basilica da Estrela, which you can glimpse from right outside the door). It's hard to understate how small the apartment is; but it was fine for me staying there on my own. One thing to be aware of: the bathroom doesn't have a proper door -- it's made of slats of wood with spaces between them, so not a lot of privacy if two people are staying there. The place also smelled and felt a bit damp (it was rainy when I was there so might be fine in clear weather). Carolina was very prompt at replying and kindly waited around to let me in when I was running late and couldn't contact her because of cell phone issues.