There is & There are

1) In Vincent's bedroom there is a bed and there is a window.

2) In Vincent's bedroom there are 2 chairs and there are 2 pillows.

3) In Vincent's bedroom there isn't any bookshelf.

4) In Vincent's bedroom there aren't 2 beds.

Questions

Is there a window in Vincent's bedroom?  Yes, there is.
Are there 2 pillows in a Vincent's bedroom?  Yes, there are.

Is there any towel hanging off the wall?  No, there isn't.

How many chairs are there in the Vincent's bedroom?  There are 2 chairs.