Great place in many ways as the other comments mention, so I will only highlight 2 negative points and 1 comment:
1) the walls are not soundproofed so you can hear everything going on especially in the flat above - so bring ear plugs if you need peace and calm when you go to bed
2) parking in the area is an issue (as it always is in Lisbon) so just be aware of that in advance
3) the checkin at Ave de la Liberdade was not a problem for us as we were aware of it in advance and we had a car, but I can imagine it would be an issue for those with heavy bags and travelling by foot