Could you please tell me if there is any errors in this sentences?
There are many seats there, including outside seats and seats in air-conditioned room, which is located upstairs and has a small lovely bookshelf.

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Answer

Hi Pham

There are many seats there, including outdoor seating and an air-conditioned room located upstairs which has a small but lovely bookshelf.

Answer

The place includes many seats: both in the outside area and in the air-conditioned room, which is located upstairs where you can also find a small but lovely bookshelf.