We had a great stay at this hotel in the 18th district (couple blocks from Moulin Rouge). Check in was easy (like standard hotel). The room and shared bathroom was very clean. We had no issues with the shared bathroom and was really impressed that we had no noise issues. The room is a bit small but a good value for what you pay.
There's an option to add breakfast buffet for 9 Euros that was decent (items from local bakeries, boiled eggs, cheeses, some meats, yogurt, etc).
Just a heads up, there is no A/C (common for Europe). You have a fan and large window.