We stayed en extended weekend at Matthias' apartement. The appartment was clean, lovely decorated and filled with daylight! Even though its pretty small (I guess that's usual for Paris) it offers everything you need! For example as we went to a wedding in Paris, we were happy there was even an ironing board. Shortly: the apartment is exactely as described by Matthias.
Communication with Matthias was ok, sometimes it took a long time until I got an answer on a message. But in the end everything went smoothly and he was very uncomplicated, eg. with checking-in&-out times. I can recommend Matthias' apartment and would definitely stay there again: a great location in Marais in a cute apartment! Thanks Matthias