I've stayed in a few basement apartments through Airbnb, and I'd say this is among the best. There was plenty of light where I needed it and the amenities were excellent, especially the kitchen and living area. There's plenty of space and homey touches throughout and Martha is extremely communicative while maintaining your privacy.
Being in the basement, there were some sporadic noises from the main house (and Martha is very transparent about this); if you're particularly sensitive to noise, you might try looking at Martha's other listing which is a detached guest house that I also stayed in for two months.
If you're looking for a comfortable space that feels suburban but is very close to groceries, restaurants, and downtown, this is the spot!