I took several lessons from @Alex TT Barcelona and I can wholeheartedly recommend him as a great teacher. He makes sure you understand the lesson material, then goes ahead and writes a detailed summary of the lesson soon after it's over. That summary often includes links to youtube so that you could see what is hard to show in VR, like footwork etc. Also, he makes ball machine exercises tailored for your needs and thoroughly explains how to work on them. He is also very friendly and accommodating, so if you are looking for a great TT tutor - he's the one. :) Thank you @Alex TT Barcelona and I'm looking forward to having more sessions.