public class ApartmentController : Controller
{
    private readonly IApartmentRepository _apartmentRepository;

    public ApartmentController(IApartmentRepository apartmentRepository)
    {
        _apartmentRepository = apartmentRepository;
    }

    //...codes

    [HttpGet]
    public ActionResult List()
    {
        var apartmentList = _apartmentRepository.GetAll().ToList();
        return View(apartmentList);
    }

    //...codes
}

<div class="dataTables_wrapper">
<table class="table table-bordered table-striped" id="dataTable">
    <thead>
        <tr>
            <th>Id</th>
            <th>Door Number</th>
            <th>Floor Number</th>
            <th>Capacity</th>
            <th>Fullness</th>
            <th>Apartment Name</th>
            <th></th>
        </tr>
    </thead>
    <tbody>
        @foreach (var item in Model.ToList())
        {
            <tr>
                <td>@item.Id</td>
                <td>@item.DoorNumber</td>
                <td>@item.FloorNumber</td>
                <td>@item.Capacity</td>
                <td>@item.Fullness</td>
                <td>@item.ApartmentRoom.Where(x => x.RoomID == item.Id).Select(x => x.Apartment.ApartmentName)</td>
                <td>
                    @Html.ActionLink("Düzenle", "Edit", new { id = item.Id })
                    @Html.ActionLink("Sil", "Delete", new { id = item.Id })
                </td>
            </tr>
        }
    </tbody>
</table>