Tds and service tax related query for renting space

Hello,

I have given my office space to one private company on rent of 2L/month which includes Building Maintenance, Government Taxes, electricity bill, 2 watchmen and cleaning service from my side. The company is giving me payment after deducting 10% TDS. 

I have also taken 6L as a deposit. Am I liable to pay any kind of tax on it? Does deposit count in turnover of 10L for service tax?

i have also invested approx 20L in furniture of office

So, My Query is Max how much TDS can I claim for refund ? also m I liable to pay service tax? If yes then how much? and a possible way to reduce that amount.