I made a decision.

It's Monday.

I woke up a bit later than usual and took a later bus to work as it took longer to fall asleep last night because of the temperature of my room. It was too cold even though I was in bed and covered with a duvet and a blanket. (I'd recommend using shorter sentences to sound more natural.)

After work, I went to Central London to teach Japanese at the an evening class. Actually, it was my last class on Monday as I decided to quit this school and my final class will be on this Thursday. (better: Actually, I decided to quit my job at this school, so it was my last class on a Monday, and my final class will be this Thursday)
At the end of the class, I told my students that it was our last class which made them shocked them. One of them said, "Why don't you keep doing just our class. I will miss you."
And the Another student said, "but it is good to do what you want, good luck."

I was happy to have them in my class.

I might start to do private classes, but I'm not sure yet. I need time to think about it, how to manage my limited time in London!

It's lovely that your students appreciated your work and wanted the best for you. Good luck with whatever you decide!

Novel review, kindly leave your corrections. (Alternative that sounds less demanding: "I'd appreciate your corrections" or "Any corrections would be appreciated")

The Woman in the Window: it's really a great the best novel I have ever read for in a long time. The author could takes you on a journey into a the human soul which of a woman who lives alone in her house. and She only likes to do three things: drink hard alcohols, watch old movies and watch her neighbors from her window by through her camera and takes while taking photos for of them. One a day, she watched a crime in a one of her neighbor's houses (alternative: watched a crime in her neighbor's house) and she called a the police. but No one believed her because she was always oblivious, and her therapist told the police that she takes more a lot of medicines that makes her irrational and unaware. Moreover Therefore, the evidence of crime was obliterated.

I liked it so much, and I would recommend that you read it.

I'm glad you enjoyed the book - keep reading! :)