Where is the best place to advertise a chair space?

I am opening a business and have 2 extra spaces to rent out within my room. I had 2 people interested but has since let me down. My room is on a busy high street in Zone 3 and I am asking for £35 a day which I think is reasonable.

Can you please point me in the right direction as to where the best place or best websites to advertise on?

Many Thanks