A nice location is you're looking to be in the thick of Alfama (which we were).
The downside to this flat are the dark & stuffy bedrooms - the one bedroom has no window at all, and the other has a window that opens onto a neighbours outdoor area so you can't have it open. The hosts do provide fans, but we found it a bit unpleasant to stay in these rooms. The bathroom was also quite dark and 'dingy' and got very steamy after a shower as you couldn't open the window in there more than a tiny crack.
The flat has very basic furnishings - the couch was small and quite uncomfortable and all of the plants are plastic (which I do understand, being an Airbnb, but it made it feel quite cheap).
The hosts were fantastic with their communications - thorough and prompt.