We spent a week and this was, for us, the best possible location we could have wished for. At the junction of Chiado and Bairro Alto, you have walkable access to everything. There are wonderful restaurants. Try Taberna Avillez a block and a half away. Several lovely restaurants with fado music within a block or two. Markets close by.
The apartment is lovely and comfortable. You may have night life street noise some nights with windows open, but we enjoyed that. The elevator is a nice bonus when coming home tired. Very secure and safe home.
We plan on returning.