From the pictures this apartment seems to be a bright place. In reality due to the one window it's pretty dark with just a few lights which don't brighten up the room properly.
Also, just like the other guests said the ceiling is quite low especially in the bedroom and you can hear every single footstep of the person who is living above.
We had a few communication issues in the beginning but João is a really nice person in general.
It is a good apartment if you are planning to spent your time visiting Lisbon over the day.