Great space. Works well with older children. We were down in the cellar room which had a hatch for a bit of privacy from the kids. One double bed above the bathroom (mezzanine level) for 2 kids and one kid on the double sofa bed.
Fab location.
Facilities fine (no oven).
Worked out really well.
They also very kindly let us leave our bags for an extra 1 1/2 hours which was great as we wanted to go to the local Luxembourg gardens which is only a short walk away.