The Charlotte Mason approach is very different to the Montessori approach. However, I love the Charlotte Mason focus on nature study and the significance of the 'atmosphere'. Miss Mason wrote “Education is an atmosphere, a discipline, a life.". Here are a few really lovely Charlotte Mason inspired learning spaces. 

Above the homeschooling room at Wildflowers and Marbles. 

Pyjama School Learning Space. These are good examples of setting up a home schooling space in a home, Charlotte Mason or otherwise. 

Farmhouse Schoolhouse - which has an amazing range of environments and materials, including some Montessori influences. You know I love this space, the wall posters, and the natural materials! 

This room is huge at Ann Voskamp - Best Ways to Organize a Homeschool Classroom. 

More at Ann Voskamp - 5 Secrets for Every Day One: First Day Back to School. 

If you are wanting information on setting up a Charlotte Mason inspired environment have a look at:

Creating a Mason Atmosphere on a Dime at the Charlotte Mason Institute. 

Setting Up A Home School Room at Ambleside Schools International. 

I also think this is a fantastic way of looking at things, 18 Things Charlotte Mason Expected Six Year Olds to Know.