Profesora de español con más de 10 años de experiencia y máster en enseñanza de lenguas extranjeras. Especialista en mejorar el nivel comunicativo (adquisición de vocabulario y fluidez al hablar)

Précisions

I'm a professional language instructor, this is my job. I charge my classes in advance, and I'm flexible to change dates, but if we agree on a date you need to transfer that day (even if we then reschedule). Rescheduling has to happen for the same week.
Based on my extended experience teaching private lessons, I strongly recommend you set aside one fix date. This way you have more chances of improving your skills, it's cheaper because it allows you to buy packets and, why not, it's also better for me.