This sounds pretty cool. I do backend development and if I wanted to learn modern web development or functional programming I could see myself potentially using a service like this. (Of course someone saying they would be interested and having a paying customer is very different!)
The pricing seems unsustainably low. If each person spends 1 hour with a mentor per week, it seems like the price would have to be at least 5x more to make any profit given that your mentors are expensive skilled developers.
For "Co-coding Evenings", when you request help, is it through a chat room? Or screen sharing?
You may want to look into https://www.bloc.io. It's more of an online coding bootcamp, but a big part of it is having a personal mentor who can answer your questions.
