Martin is an amazing host. He met us downstairs, helped us take all our baggage upstairs, showed us how everying worked around the apartment and then walked around the neighbourhood with us pointing out various local eateries and other useful amenities.
He was very friendly and didn't seem in a rush to just meet us and leave. He spent at least half an hour with us - probably more, as I wasn't keeping track of the time.
His apartment was exactly as described overlooking the canal. It has a lot of personality and we felt comfortable during our stay.
Great host, great apartment, great location. Would highly recommend for your stay in Paris.