Where or where should the classroom go?

So here is the debate, where should we set up the classroom? We have three rooms that we have in mind; the office/guest room down stairs, the guest room upstairs, or the loft upstair.

The office/guestroom

the good

On the main level

Can be closed off

Connected to a bathroom

Good size

the bad

It is my husband office

No closet (closet being used for something else that cannot be moved)

The guestroom

the good

Can be closed off

Near a bathroom

Two windows

There is a closet in the room

the bad

It is located upstairs

It is our official guestroom

Smallest of the three

The loft

the good

Largest of all options

Good amount of natural sunlight

Open, not used space

Near a bathroom

the bad

Cannot be closed off

Near the stairs

No closet

So many thoughts to think about.

I love the idea of the loft because of the amount of room my children would have to spread out and work, but it would not contain the children because they would want to go into their rooms and go down the stair. But I do love the windows, and we can buy a storage closet to place in the room.

My favorite idea in the office/guestroom, but my husband needs his office (he works from home), also we would have to use a storage closet for the school supplies, and will have to find new homes for the storage.

The guest room would be great also, but I love having a guest bedroom, but I guess we already have one guestroom, and it can be contained with a closet, BUT it is the smallest choice.

hmmmmmm