As much as I lived Lisbon, I didn't like much the flat. It's not comfortable and not friendly. The bad is cheap and extremely soft which is even worse in the hot summer. Positively the earplugs are provided.
The flat is not new as advertised but just cosmetically decorated. Old building gives away the noise and the smells, despite the fact that it is cleaned up regularly.
No particular value added by the hosts. I survived but I won't come back and I'd prefer to stay at a hotel if I find one in the same area for the same price.