In summary: Ana's duplex flat is a great place for any solo travellers who want to discover Lisboa and who don't mind noise from others. I was particularly pleased with how helpful and communicative a host she was, as well as the location of the flat in the heart of Mouraria and just 5 minutes away from my favourite Miradouro do Gracia! Unfortunately, I need to be honest and admit, I can only recommend the flat to people who don't mind noise. It's an old building with extremely thin walls, and the bedroom faces the living room and bathrooms of 2 of the neighbouring flats (also airbnbs). I could hear people eating, talking, taking a shower, opening cupboards and even receiving notifications on their phones - all of it as clear as if they were in the same room. On two occasions I had to knock on the neighbours' doors because it was impossible to rest, even with ear plugs in - once a cheerful group of 4+ guests was having breakfast at 7:30am on a Sunday, another time people were having dinner and a lively conversation at 1am. Not sure if there is anything the host could do to improve this, but for anyone staying longer than a night (I stayed over 9 days), the flat is not a suitable place for rest and quiet.