I can vouch - they are gaijin friendly but require a pretty high level of Japanese and it does vary on a girl-to-girl basis.
Be aware of the upcharges on the high-ranked girls, though. They have a lot of AV models working there and they usually run an additional 30,000 JPY or so over the regular rates.
Its all stated on the individual girls page and they'll tell you when you call to make the reservation (its very much a legit shop - nothing shady) but if you thought you were going to see that super cute unblurred girl for the regular rates you may be in for a bit of sticker shock.