We stayed for 3 nights on a last minute booking for the Olympics. Very dated, but clean, cheap and just a short walk away from the Moulin Rouge with good transport links. The rooms are right above a very noisy, popular bar, we were knackered so slept well regardless but could be seriously annoying if you weren't able to ignore it. It was fine as a bed and shower but nothing else. Narrow winding staircase to get to rooms, we didn't fancy trying the lift. No safes in rooms or kettle or anything.
So if you want very basic with good transport links it's worth a go, if you want anymore comfort look elsewhere.