Personally, I've had several classes with Alexandra, and it was amazing to find out how my intonation (influenced by my Northern Irish pronunciation of English) was really impacting upon my ability to communicate with natives here in Spain.
After just a few classes, I began to notice, with Alexandra's guidance, exactly what several of the problems were. My rising intonation in sentences made many things sound like a question, even when I was saying something simple, whilst my incorrectly structured speech (pausing after the wrong word, trying to say sentences with an English rhythm) was resulting in a lack of clarity.
I quickly noticed as I began to implement some of the things that I learnt in Alexandra's very engaging classes, that I was having fewer problems in making myself understood and people were asking me to repeat myself less and less.
Of course, there's still a lot of work to be done, but if anyone is curious, I really recommend a class with Alexandra! You won't be disappointed. Only a few days ago, she had me working on intonation through kick-starting my rapping career :D