I'd recommend Tolly as a first punt. She speaks excellent English and is easy to chat to, a pretty safe location, though her and Jessie are popular so there is a lot of footfall through their door ( share the same flat ). Only thing you might find off putting with Tolly is she will answer her phone calls/texts while with you, I've heard Jessie doesn't.
BTW, their prices are the same, though it is not so clear on Tollys profile that OWO/FK/RO are extra.