I have another apartment that has been closed for a long time. Now I want to rent it out. But before that I need to do some cleaning. Can you tell me who can help in this matter?

I think if there is just dust and cleaning due to the absence of people in the apartment, then you can solve the issue yourself. And if you have finances, then invite a cleaning company that provides business cleaning services near me. I would recommend you to try to go to the link https://briiz.com.mt/ Maybe it will solve your problem.