One possible version
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Dear Millie,
I want to introduce my hometown to you. My home is about 5 kilometers from the city center.It takes 10 minutes by bike. There is a park there. I can do exercise in the park. I can also smell the flowers and hear the birds sing.
There are 20 buildings in my neighborhood. My neighbors are kind and helpful. They often help us with all kinds of problems.I live on the fourth floor. There is a big sitting room, a clean kitchen and comfortable bedrooms.
I think it’s a good place to live. I hope you can come and visit it soon.
Yours,
Eric