I'll start off positive, the staff are nice and welcoming, the location is perfection! 2 Metro stations, buses, lots of restaurants & shops less than 5mins away.
Ok...
Unfortunately, the initial room I was given was in poor condition, very small, part of the ceiling was coming down & the light picture above the bed was coming off too (I have vids but no pics). The heating didn't work properly, it wouldn't stay on. I was there for 4 nights on the 3rd night I couldn't take it anymore I was freezing, it's Feb & very cold. I went to reception, he (receptionist) attempted to get heating to work, it didn't I came back down and let him know, he came up checked and even he was surprised by state of the room and how cold it was, he moved me to a new room which was better. Heating worked, no decor problems and it had a little more space.
The location is fantastic! Louvre Museum & Notre Dame are about 20min walk away & Eiffel Tower is less than 20mins via the metro.
Things to note there's no fridge or kettle in the room, which would be very useful.
Like other reviews stated, I would say this is more of a 3star than 4.
I'd stay again, based solely on the location and only if I can get a decent room first time instead of suffering in the first room. But only for one or 2 nights. If I stay longer, I would stay elsewhere as I need more space and comfort.
I didn't have the breakfast so I can't comment on that.
Overall, 3stars that's for the friendly staff and location.