Sadly there has been a lot of rain in Lisbon in December and January. The walls were damp and particularly in the bedroom, the walls were covered in mould. As the apartment doesn't see the sun it's likely the problem will exist for many months. I ended up getting really ill and had to see a doctor - nearly 2 weeks later I'm only just getting back to OK. I don't think it's suitable for people until it has had a proper chance to dry out.