Include progress-spinner into creator-room component.

src/app/creator-room/creator-room.component.html

 <div fxLayout="column" fxLayoutAlign="start" fxLayoutGap="20px" fxFill>
   <div fxLayout="row" fxLayoutAlign="center">
+    <mat-progress-spinner *ngIf="isLoading" mode="indeterminate"></mat-progress-spinner>
     <mat-card *ngIf="room">
       <mat-card-header>
         <mat-card-title><h3 class="subheading-2">{{ room.name }}</h3></mat-card-title>

src/app/room/room.component.ts

@@ -10,6 +10,7 @@ import { ActivatedRoute } from '@angular/router';
 })
 export class RoomComponent implements OnInit {
   room: Room = null;
+  isLoading = true;
 
   constructor(protected roomService: RoomService,
               protected route: ActivatedRoute) {
@@ -22,6 +23,9 @@ export class RoomComponent implements OnInit {
   }
 
   getRoom(id: string): void {
-    this.roomService.getRoom(id).subscribe(room => this.room = room);
+    this.roomService.getRoom(id).subscribe(room => {
+      this.room = room;
+      this.isLoading = false;
+    });
   }
 }