Good experience - fascinating instructor
Mario got me off to the good start with the instrument.
Lessons by Skype are a bit of a challenge. Probably more for Mario than me.
I would recommend Melody and Mario.
I went to New York last spring for a face-to-face lesson. After the lesson, Mario, his wife, and I went to a fund raiser for the American Accordion Association (the other AAA). He performed there with his wife, Mary Mancini. If you have not gone to Youtube to hear them, you should.