We really enjoyed our stay at Michael's flat and would highly recommend it. The lock at the door can be tricky, but once you get it, it works well. We didn't have keys, but that wasn't a problem throughout our stay.
Although there were some plumbing issues, Michael was always very responsive and willing to help.
Great location - very close to two Metro stops and just blocks from the Louvre pyramids. Can't beat the location at all.
Japanese restaurant across the street is fantastic - we went there twice. Great owners who were very friendly. Give them a visit if you find yourself wanting a late night sushi run.