Highly recommendable. We didn't find anything wrong with the apartment, the location and the host. On the contrary the apartment was as described on the site (and very clean), the location resulted to be just great (in the very center, on a pedestrian street, no traffic noise, connected with all the main public transports) and the host was very friendly and readily available the few times we needed her. The absence of an elevator (third floor) was not a problem for us.
If you want a no-frill apartment (but with all the necessary things) in the heart of Lisbon look no further.