Very vibrant location and very cosy, but yet spacious apartment with a small terrace on the top floor. We were 4 people (2 couples) and had everything we need for feeling ourselves like at home.
Location is super convenient and central, right next to the bars and restaurants as well as famous time out market (highly recommended for local eating experience).
The only problem we had is crazy loud music at night (lasts till 4am) as right underneath the apartment there are several bars. The apartment is on top floor, but music was extremely loud. But probably cause we were at Christmas time and there were lots of celebrations going on those days. Anyway, earplugs are recommended ;)
All in all, if you are more for parting and being in the pulsing heart of Lisboa - highly recommended for staying there!