public void AddApartmentForRent()
        {
            Console.Write("Apartment ID: ");
            int id = int.Parse(Console.ReadLine());

            Console.Write("Address: ");
            string address = Console.ReadLine();

            Console.Write("SquareMeters: ");
            int sm = int.Parse(Console.ReadLine());

            Console.Write("NumberOfRooms");
            int num       = int.Parse(Console.ReadLine());
            var apartment = new Apartment
            {
                ID            = id,
                Address       = address,
                SquareMeters  = sm,
                NumberOfRooms = num
            };

            ApartmentsForRent.Add(apartment);
        }
        private void RentApartment()
        {
            Console.WriteLine("Available apartments for rent: ");
            foreach (var apartment in ApartmentsForRent)
            {
                apartment.Print();
            }
            Console.WriteLine("Choose by typing the id of the apartment! ");
            int apartmentID = int.Parse(Console.ReadLine());

            Console.WriteLine("Write you name:");
            string name = Console.ReadLine();

            Console.WriteLine("NumberO of Days:");
            int days          = int.Parse(Console.ReadLine());
            var tempApartment = new Apartment();

            foreach (var apartment1 in ApartmentsForRent)
            {
                if (apartment1.ID == apartmentID)
                {
                    tempApartment = apartment1;
                }
            }
            var apartmentRent = new ApartmentRent
            {
                ID           = apartmentID,
                LesseeName   = name,
                NumberOfDays = days,
                PricePerDay  = 20.0,
                Apartment    = tempApartment,
                EntryDate    = DateTime.Now
            };

            ApartmentRents.Add(apartmentRent);
            ApartmentsForRent.Remove(tempApartment);
        }