This is a great place to start, and also works well for kids, but is also a reasonable place for an adult to start.
The main reason this 10-Note Kalimba is great to learn on is that it shares all of the layout features with the bigger Kalimbas, but it only has a few notes - just enough for you to get the principles without being overwhelmed. Everything you learn here can be fully transferred to the bigger kalimbas. They are basic instruments that are easy to learn on, but still good instruments and anyone can play one.
Love my new 10-Key Gecko Kalimba. It's tiny and has a beautiful tone! It's much smaller than 17-Key Gecko solid Camphor wood Kalimba and the keys are more narrow. It's like mother and a baby. Love them both!