Very surprised there isn't a review for this place already! Definitely the best choice for foreigners who need to visit a GP.
The doctors and desk staff all speak English (most, if not all, are native speakers or at that level). Any testing/imaging you need can be done at the attached hospital. Fees are slightly higher than other places (a consultation is still very reasonably priced), but it's worth it to speak to a Western-trained doctor in English.
I recently had to visit several times for an ongoing medical issue, and am very happy with the quality of treatment there. Dr. Lui in particular is fantastic.
Having been to Calmette and Richland, and heard stories of some of the other clinics around town, Grace is the only one I'd recommend.