Refactored and fixed errors

SchengenVisaApi/ApplicationLayer/VisaApplications/Models/AddressModel.cs

@@ -2,11 +2,8 @@
 
 public class AddressModel
 {
-    /// Country part of address
-    public string Country { get; set; } = null!;
-
     /// City part of address
-    public string City { get; set; } = null!;
+    public Guid CityId { get; set; }
 
     /// Street part of address
     public string Street { get; set; } = null!;

SchengenVisaApi/ApplicationLayer/VisaApplications/Models/PastVisitModel.cs

@@ -0,0 +1,14 @@
+namespace ApplicationLayer.VisaApplications.Models
+{
+    public class PastVisitModel
+    {
+        /// First day of <see cref="PastVisitModel"/>
+        public DateTime StartDate { get; set; }
+
+        /// Last day of <see cref="PastVisitModel"/>
+        public DateTime EndDate { get; set; }
+
+        /// Identifier of destination country of <see cref="PastVisitModel"/>
+        public Guid DestinationCountryId { get; set; }
+    }
+}