Do you use time of arrival techniques? What strategy do you use to overcome indoor multi-path conditions? Are there more detailed implementation notes somewhere?

Reading the documentation, I agree that you're abstracting away the "nitty-gritty" of location-finding, but I think it'd be really helpful to see where measurement errors might be hiding via an open description of the computational model used, even if (or especially if) it's very simple. It would give me more confidence as a user and allow me to be more forgiving if there were reasonable discrepancies in measurements.

Looks really cool! I think I'd like to try this and write about my experiences.