Just got back from CUSLIM. Used Green Taxi to CBD (San Isidro, Novotel) and cost 40 soles (30 min, no highway). English not great (nor my Spanish) but we worked my return for the next day during drive and he showed about 15 minutes early. No problems with fare or timeliness--seatbelts work too as got into minor fender bender with a car sitting in intersection. Apparently yelling at each other and settling for 80 soles!?!?! [with visible damage] after 30 minutes is legit there. I'd recommend them nonetheless--stuck to published fare (bring cash), seatbelts, on time.