Mathilde's apartment was exactly as described, scrupulously clean and in a fantastic location. Communication with Mathilde was excellent - very quick response to any queries before arrival and very clear entrance instructions.
For size, location, facilities and in one of the safest and best areas to stay in Paris, it is very good value.
The Marais is charming -full of classic and quirky restaurants bars and shops and you can walk to most of the main tourist attractions.
The apartment is on the 3rd floor of a building in a beautiful, old and classic Paris courtyard. It is true that there is no elevator, but the spiral staircase up was solid enough, quite wide, and less of a problem than mentioned in some reviews.
The treads are shallow and level, just at a bit of an angle at some points. Given the age of this historic building, we found it part of the charm. Some of our group are in their 60's and had no problems! You would need to watch children on them, just as you would in any old building.
Overall it suited our group of 7 ladies very well and we would definitely book again.