No, "কামরা" means "room" or "chamber"; it's not the appropriate word to use when talking about an apartment. Generally speaking, we'd commonly just use the English loanword "apartment"/"অ্যাপার্টমেন্ট". If you must use a Bengali word, "বাসা" would be most appropriate. "বাসা" has the general meaning of "house". But if that conjures up the image of a detached house, don't worry - the word is more versatile than that. Where I live is my বাসা, whether it's a pigeonhole, an apartment, or a mansion.