Goddess Natashka is awesome (www.pro-dommes.com). She has been around for many, many years and truly knows exactly what she is doing in all phases of BDSM. Only issue can be with pre-session communication if you use a lot of colloquialisms or try to make subtle jokes since English is at least her second language (although she is fluent since she has lived in the US and especially Vegas for many years). If you keep to specifics about what you are looking for from a BDSM perspective as well as when you wish to session, rather than being really wordy, it is not an issue.

One tip, if you are into role play, is that you should take advantage of her background and ask for an interrogation scenario where you are an American spy since she was born and grew up in the USSR. It's an experience you can't get from either an American born or a 20 year old Russian Domme.