I am looking for an apartment for a woman from May :)

My name is Marlena, I'm 38 years old. I'm looking for an apartment to rent starting in May. Over 30m2.I have a steady job and never owe rent. The apartment must have one bedroom. It's very, very, very important that the apartment be soundproofed. I don't want to hear every footstep upstairs, etc. I often work 12 hours a day, so I want to have a place where I can relax in SILENCE. I'm not a compulsive person, I keep things tidy, and I value peace and quiet. I'm looking for an apartment no more than 20 km from Oslo. The apartment is unfurnished. Oslo city center is out of the question. My maximum price is 13.500 (including all utilities, electricity, etc. for a small negotiation). I need parking for one car. If you have a suitable apartment, please contact me. Regards, Marlena.