Good points:
Flat location is awesome for doing some tourism. Blue-House people are correct and provide a lot of information.
Bad points:
Entire flat is very old. Bathroom smells really really bad, shower is tiny and not very comfortable.
Pillows are small and very used, we asked for three more pillows and the new ones came with no pillowcase.
Flat is extremely noisy, is inside the main party-street of Lisbon, literally above two bars. Windows were old and don't close properly, so noise doesn't let you sleep until 4am when people leave the street.
Blue-House charged us 4€ per bag for keeping then during a couple of hours, just for walking around before taking the flight back. Unacceptable.
All these issues can be accepted at 45€ per night price, but we were charged 110€ per night.