Like the previous user noted below, the reviews I read before don't really match up to the reality of the classroom. I too took History 127A with Professor Lenhoff and she proved to be quite a kind and caring professor. She always told the class to interrupt her if we had any questions and enjoyed tying in medieval Russia to the modern political stage by, for example, citing current-day events in Russia and the United States. Provided that you actually prepared for the midterm (by prepare the following is to be understood: thoroughly reading the notes, skimming through the text, and glancing cursorily through the primary documents), an A is very doable. For students who speak Russian or are from the former USSR, like me, things are a little easier to relate to and understand, although Professor Lenhoff presents everything in layman's terms and yes, she does indeed answer her e-mails.

Perhaps the only complaints I had of her is that she enjoys to select the inaccuracies in one of the texts (Riasnovsky, History of Russia) for the course. Should you stray, for instance, from her viewpoint that the Mongol invasions of Russia had both good and bad sides might lead to a decreased grade. For this reason, it would serve you well if you read from a text which is not assigned for reading but highly recommended by her and me called "Medieval Russia" by Janet Martin. Other than that, this class was both informative and entertaining.

I actually am taking History M127A, or Russian M118, it didn't let me submit the review without selecting Slavic 599 for some reason.
For the most part, I disagree with the bad reviews below.

First of all, I have taken lots of notes and done all the readings, and I easily got an A on the midterm with very little studying. Furthermore, I COULD HAVE easily gotten an A on it if I had done NONE of the readings, but just gone to lecture. She basically tells you that everything in the textbook is false, and she gives detailed lectures that are hard to keep up with, but she emphasises the most important stuff for the tests over, and over, and over. Any difficult names or dates she wants you to remember, she writes on the board, and it's really not that much...especially after taking Russian 90 (intro to Russ civilization) with the nightmare Professor Klenin, this class is a piece of cake, and it's actually interesting if you care about Russia at all.
She tries to relate stuff from medieval Russia to both the Soviet historians and current events in Russia.

Professor Lenhoff absolutely DOES take questions in the middle of her lectures, even in the middle of her sentences usually if she sees you. She will learn your name quickly if you ask questions, and she will like you as long as you do ask something here or there. She answers emails.
She doesn't give study guides anymore, but you REALLY don't need them if you've listened to her lectures. If you know anything about the period, you have an advantage, so I guess I'm biased in that sense.

Either way, although she tends to speak too quietly and it's not always enthralling if you don't like Russian History, an A is definitely within reach. All you need to do is read the primary sources, which seems hard but they're really short, and you can easily just skip the long textbook info if you go to class and don't sleep while you're there.