Hi Emily. How the challenge going for you? Are you at 1.000 subs yet? :)
As my wife and I kinda have the same issue, we have actually found really good locations at our work place that we are allowed to use. It kinda looks like a professional office...because it is :) We work at a university, if you have one nearby, you can always ask their media undergraduates/teachers if they have studios that you could use or rent! They already have the optimized locations for video and sound!