The flat itself was fine (good location but it could have been cleaner and the smell from the drains was bad, as most reviews have mentioned). However, the main reason I wouln't recommend this property is because of the noise- unfortunate as it's not the fault of the host. The upstairs neighbour doesn't respect Lisbon's 'quiet hours' and kept us awake throughout the night for most of our stay. At 8am daily the building works started next door and the hammering and drilling that went on all day made it impossible to relax in the flat.
I will say- the host responded well when we complained. They tried to fix the drain smell and they spoke to the neighbour. However until noisy neighbour and building works issues are resolved, I wouldn't recommend.