Please,my English is correct check.

This would be:

Please check that my English is correct.

Usually the verb is in front of the noun.

We have several common area .
You can will reservation twice a month.

This would be:

We have several common areas. You can reserve twice a month.

You would have to take the noun reservation and turn it into a verb. Also you do not need will in that sentence since can and will are double positives. 

It’s just guest room fee but other common areas is free.

This would be:

It's just a guest room fee, but other common areas is free.

For this you add a comma after fee because when you are speaking you would normally take a pause. Also it is also contrasting from the first phrase.

We have 1guest room.
It’s costs ¥2000 one night,
But extra fee ¥
We can will lent you to need electric pot.

This would be:

We have one guest room. It costs ¥2000 one night, but extra ¥1000 for towels and soap. Also, we can lend you an electric pot.

One and guest should be separate word. You also do not need because in the sentence because it is already implied that it will be for the towels and soap. I would personally break it into two sentences so it does not turn into a run on sentence. With that I used the word also to show how it also includes that.

I hope this helped! And if you would like to become speaking buddies, you can message me!!