You can consider placing cafe-height tables in this particular room in the office. You can also use utility tables for placing kettles, coffee makers and other appliances. You can have basic folding chairs to save space and accommodate more people at the same time.
You can readily consider wood coffee tables or ones with metal legs and glass top. Glass and wood is a classy combination as well. Tub chairs are among the best options for the waiting room. You can consider adding a sofa with two, three or more seats. It is essential for the chairs to be strong and durable and to have finish which is resistant to natural wear and tear and easy to clean.