Hi msmouse,
Great question. Langtrees is a great establishment and certainly has some beautiful genuinely bi laides working there. It really depends on how comfortable you feel in terms of entering an establishment or seeing a private escort. If you're happy to go to an establishment, then Langtrees is the best- you're able to have a chat to all of the ladies in a lounge area, and the setting is very classy and comfortable. If you're after a more discrete booking, than private is the way to go. Feel free to PM me if you have any more questions.
Take care,