Probably I can help you. Even though I am not a professional teacher, I help some English speakers on the internet, so I have a bit of experience.
Recently I found a wonderful old grammar book . It is the one my mother used when she was at school. Everything is very well explained in this book, printed in 1935!, and it is very useful even for me.
So we could have Italian conversation, while I am in the hall and the museum is open (FREE), or, if you need my undivided attention, we can make an appointment and meet in the Altana or to the concert hall.
In general, most find speaking to be easiest, but conquering Italian grammar rules can be more challenging. I had classical studies and this helps me a lot in the knowledge of the Italian language. Even if all you want to do is hone your conversational Italian, why not chat with a native Italian speaker while visiting Italy ?
I only charge if we book 30 mins or more of my time. And my rate is only 8 euros/hr. If we meet while I am working in the Hall, I don’t charge at all.