What a lovely apartment!
Amazingly located exactly halfway between Pompidou Center and Forum des Halles - the location is unbeatable.
The apartment itself is cozy, spotless clean, nicely decorated with a true retro vibe (I want those chairs to myself!!!), very spacious for a couple - but it should be convenient enough for two couples as well.
Wooden floor is old and VERY squeaky - but I actually liked it! :) Full of character.
Bed is large and comfortable (didn't try the sofa bed), heating works fine, and the double layered curtains block the sunlight perfectly when you want to sleep.
Regarding the noise - surprisingly, there was almost none! VERY minimal, really, I didn't even think to try the earplugs that Victoria left, even on the worst rush hour. However, it was November, so I could sleep with the windows shut. With the windows open, indeed the place got very noisy.
Bathroom was great, renovated and clean, good water pressure. More than two people might need to take REALLY quick showers (or wait a bit between showers) - because the hot water runs out a little fast. But for two people it's totally fine.
The apartment is on the first floor (one floor up above entrance). The building is in good shape, quiet, clean, code-lock at the front door. It is very old - which means a lot of character and good vibes, but also some quirky stuff :) like quite a narrow spiral staircase, and a BIZARRELY tiny elevator - only good for reasonably sized luggage and reasonably thin people.
Check in/out were very easy - you pick up the keys by yourself.
And finally - Victoria! :) was constantly responsive, communicative, helpful, made a real effort to allow me to leave my luggage early, in short - FIVE STARS. Thanks Victoria! I loved your place, and I'll be happy to come back again on my next trip to Paris.