If you've booked Mona, make sure you're getting Mona...She usually has another girl working from her flat, so when you booked you actually see the other girl. Mona's told me she only sees a few regular clients.
However, it's my fave punt destination, and I've seen 4 or 5 girls at her place over the last 18 months. If you're not interested in seeing Mona herself, ask to book Honey. She only works certain evenings, but she's great. Probably around 5ft 4, a bit heavier, but very enthusiastic. Apparently she works in a straight-up Thai massage place as her day job.