Our instructor Karen Wilke was knowledgeable and she was always there to help. I love her energy too, kind, good-hearted, intelligent, funny and smart :) You'll enjoy taking your TEFL there.
Maximo Nivel is a good school (I took Spanish there). The location is incredible, you're close to museums, libraries, the Parque Central where the banks are, restaurants, market, stores, everything you need.
After I took TEFL there, they interview you in case you like to work there. They have TEFL schools in Guatemala, Costa Rica and Peru so lots of possibilities.
Antigua, Guatemala was a wonderful place to take TEFL. It's safe, secure and very beautiful there. Maximo Nivel had everything I needed too. We have a computer room there, tutoring, coffee/tea (all free to students).