Alain is a wonderful fellow and a great communicator. He is honest about the stairs. If you are not fit this isn't for you but if you are the views are great and you have a real feel for the rooftops of Paris which I love.
do throw in some earplugs as on hot summer evenings the locals can be enjoying the nearby cafe till quite late...
thanks to Alain's place we had the perfect place and visit in Paris!!