Natacha and her boyfriend, Joao, are really nice people and very helpful. Their English is very good. Their cleaners who let us in are also very nice.
The flat is very modern and well-appointed. It is what we call in the U.S. a "railroad flat". It is long and narrow with a window at either end. You can't really sleep with the windows open, if that is important to you.
Belem is a charming area with much less noise and chaos than the center of the city. There is some street and airplane noise. The street is brightly lit.