EDITED.

Tsubaki is (5'5)168 cm tall with his geta(japanese sandals). He has height angst.

He is actually just 159 cm without his geta. The sandals add +9cm to his height. This is based from the Servamp Guide. Although the most popularly known height of Tsubaki is 165 cm, please refer to Episode 2 when he confronts Mahiru and Kuro. Compare their height together.