Main disadvantages:
Loud neighbor - due to thin walls we were not able to sleep as he was laughing/yelling during the evenings/nights. That was not comfortable at all.
Old windows - it doesn’t matter if it’s open or closed - you will hear everything from the street which is quite noisy.
Toilet - which is electric and flushing toilet paper is forbidden.
Bedding - we found some hair on the bed sheets, I don’t want to wonder weather it was cleaned or not… same with the little cushions - I doubt they were cleaned as the smell wasn’t too fresh.
There is no place to hang towels or any shelf in bathroom - small improvement but can be life changing.
Advantages:
Location - close to Montmartre which is lovely, walking distance to Louvre,
Well equipped - coffee maker, salt, tea etc.
Easy check-in (quite flexible hours),
Price
Good for short stay.