Hello Cristina!
It's wonderful that you and your husband are so motivated to learn German, I love your 3 year goal! And I'm sure I can help you achieve it.
I went to a German School in Spain since age 9. After finishing I moved to Germany where I have lived since 2012. I studied a Bachelor of Education in Spanish and Geography, to discover later that my passion was to teach foreign languages. So I started my Master of Arts in German as a foreign language. I have done some internships as a German teacher with great feedback (I have recommendation letters to back that up).
The good thing about me not being a native speaker is that I had to learn the language from the start like you will, and am capable to fully understand and address your difficulties in the learning process. But don't worry about my qualifications, as I hold a C2 certification from the Goethe Institut, which is equivalent to native speaker level.
A few months ago I decided to pause my master's degree and relocated to Mexico to start an online career, but teaching German is something that I'm very passionate about, specially if the students are so eager to learn as I think your are.
I am available at the times you mention, and the price for a month would be of 180€ (15€/hr.). I always come prepared to class and put a lot of thought on the materials.
I'd love to chat with you and see if we are a good fit. Feel free to message me anytime, I'll get back to you in less than 24 hours!
Best regards,
Mónica