Custom Info Window for Google Maps

You will want to use the markerInfoWindow delegate method along with setting the infoWindowAnchor.

When you create your marker, set the anchor:

GMSMarker *marker = [[GMSMarker alloc] init];
marker.position = MARKER_POSITION;
marker.infoWindowAnchor = CGPointMake(0.44f, 0.45f);
marker.icon = [UIImage imageNamed:@"CustomMarkerImageName"];

then create the delegate method:

- (UIView *)mapView:(GMSMapView *)mapView markerInfoWindow:(GMSMarker *)marker {
  InfoWindow *view =  [[[NSBundle mainBundle] loadNibNamed:@"InfoWindow" owner:self options:nil] objectAtIndex:0];
  view.name.text = @"Place Name";
  view.description.text = @"Place description";
  view.phone.text = @"123 456 789";
  view.placeImage.image = [UIImage imageNamed:@"customPlaceImage"];
  view.placeImage.transform = CGAffineTransformMakeRotation(-.08);
  return view;
}

In the example above I created a xib

and I loaded that xib, returning the resulting UIView. You could instead construct a UIView using just code.