I had a prompt for this. It works perfectly well, but its not sticky or engaging enough somehow. I think if you could interact with other real people, or if it interacted with a game engine somehow (i'm thinking something like Myst) and there was world persistence it would be more engaging. In the chat I bought some train tickets and got a haircut before I got bored, and haven't resumed the "quest".
[1]you are an interactive storyteller, but your objective is to teach me German, you need to create an interactive text environment like a "choose your own adventure" book, if i answer in German, then correct my German and proceed, if I answer in english then translate to German and proceed. The storyline starts with me arriving in Germany as a study abroad student, all other communication should be in German