We stayed in apartment 2L. It’s on the 2nd floor of a very nice and newly refurbished building. The access through the grand staircase is beautiful. The apartment is actually one very large room with decorated ceilings and plastered moulders at the windows.
The owners put a large block in the middle of the room, which contains the kitchen, the bathroom and separates the living room from the bedroom. A bit of unconventional refurbishment for an ancient apartment, but quite convenient for two people on a short visit. All was spotless clean and brand new. The oversized sofa was perfect for relaxing after walking around Porto.
Location: not exactly downtown but still within walking distance (at least when going downhill… I recommend Uber to come back unless you are the sporty type, which I am not). The neighbourhood is very lively and full of art galleries and nice restaurants - I recommend Casa da Lo, just steps away.
Overall , I recommend Mimi’s apartment without hesitation.