Most rudimentary test to read a list fails...

Just tossed up a new clean developer portal in O365, created an app in VS2013 Pro with the App for Sharepoint template. I've added this method that should retrieve data from a simple list in the same sharepoint site and enumerate the items in that list in a table... simple? So I thought, pretty much copy pasted code that exists as samples but I can't get it to work.

public static List<Models.KSTModel> GetKST(SharePointContext spContext)
        {
            List<Models.KSTModel> ccitems = new List<Models.KSTModel>();

            using (var clientContext = spContext.CreateUserClientContextForSPHost())
            {
                if (clientContext != null)
                {
                    //List lstKSTs = clientContext.Web.Lists.GetById(new Guid("020b3e55-abec-4e8b-aad2-5e2a38c70383"));
                    List lstKSTs = clientContext.Web.Lists.GetByTitle("Costcenters");
                    ListItemCollection lstKSTItems = lstKSTs.GetItems(CamlQuery.CreateAllItemsQuery());
                    clientContext.Load(lstKSTs);
                    clientContext.Load(lstKSTItems);
                    try {
                        clientContext.ExecuteQuery();
                        if (lstKSTItems != null)
                        {
                            foreach (ListItem lstKSTItem in lstKSTItems)
                            {
                                ccitems.Add(
                                    new Models.KSTModel { Id = lstKSTItem["Id"].ToString(), Beskrivning = lstKSTItem["Beskrivning"].ToString(), Kortnamn = lstKSTItem["Kortnamn"].ToString(), Datum = Convert.ToDateTime(lstKSTItem["Datum"]), Ansvarig = lstKSTItem["Ansvarig"].ToString() });
                            }
                        }

                    }
                    catch (Exception ex)
                    {
                        Debug.WriteLine(ex.InnerException);
                    }
                }
            }

            return ccitems;
        }

The model itself is nothing fancy, but it never gets so far as to try and populate the List<Model.KSTModel> variable...

The GetItems method of the list doesn't return anything at all. It's not null, but it also doesn't have any items. And it doesn't throw an exception either.