What is going on with the cabinet, or is there a cabinet? Does it have doors that create a center line? Does it have an opening for a basin or is it a vessel sink basin (a bowl that sits on top of the cabinet). A picture would help us help you in the best possible way, but not having seen it- 99.9% of basins must be centered under the faucet. For splashing and for aesthetics. Exceptions are rare. Good luck! I hope to see a pic and get more specific!

I do more activities to save water but couldn't be able to vote for other options. I stoped using pipe to water my plants. stopped using shower. and many more.

Usually the builders provide a separate control for each unit. Surprised to know that they don't have such basic control. You should try to fix it as soon as possible. Nitin Cornerstone Designs

You can mix polished nickel with full whites, blacks or grey interiors. However gold is preferred with wooden or a more classical room. You may see some ideas with our Decorative Fans and Contemporary Lighting here.