Bubblecow is a husband and wife team, Gary and Caroline Smailes. It offers editing and self publishing services, and online courses for synopsis writing and other things. The Bubblecow website is full of typos and is very pushy in tone, with an emphasis on selling their services.
Bubblecow edited the novel of a friend of mine and they did give her helpful advice. But she also paid Cornerstones to edit her novel and when she compared the two reports, Cornerstones left Bubblecow standing. Cornerstones's report was much more detailed, more insightful, and more broad-ranging, and went into much more depth than the one from Bubblecow which was more of a copy edit than a full edit, although as I pointed out to her after I'd looked at Bubblecow's website they do only offer copy editing services, and not full edits. I think they might be confused about what copy editing means.
I have been told that they don't turn down any work at all. That worries me because it implies that they are taking money to edit books which have no chance of being worked up to a publishable standard. So long as they make this clear to the writers they work with that would be acceptable but as far as I know they don't.