If you config +vnum, you won't see vnums on look unless config +roomflags is on. This fix for that problem also includes a cosmetic fix: Samson's color code uses } as an token, so when the game spits the string out, you see:

An empty room {205[indoors]

Which is just nasty.

In act_info.c, in function do_look, locate:

      send_to_char( " ", ch );

      if( !ch->desc->original )
      {

         if( ( get_trust( ch ) >= LEVEL_IMMORTAL ) && ( IS_SET( ch->pcdata->flags, PCFLAG_ROOM ) ) )
         {
            set_char_color( AT_BLUE, ch );   /* Added 10/17 by Kuran of */
            send_to_char( "{", ch );   /* SWReality */
            ch_printf( ch, "%d", ch->in_room->vnum );
            send_to_char( "}", ch );
            set_char_color( AT_CYAN, ch );
            send_to_char( "[", ch );
            send_to_char( flag_string( ch->in_room->room_flags, r_flags ), ch );
            send_to_char( "]", ch );
         }

      }

Change to:

      send_to_char( " ", ch );

      if( !ch->desc->original )
      {

         if( ( get_trust( ch ) >= LEVEL_IMMORTAL ) )			 
         {
			if( IS_SET( ch->act, PLR_ROOMVNUM ) )
			{
				set_char_color( AT_BLUE, ch );   /* Added 10/17 by Kuran of */
				send_to_char( "{", ch );   /* SWReality */
				ch_printf( ch, "%d", ch->in_room->vnum );
				send_to_char( "}}", ch );
			}
			if( IS_SET( ch->pcdata->flags, PCFLAG_ROOM ) )
			{
				set_char_color( AT_CYAN, ch );
				send_to_char( "[", ch );
				send_to_char( flag_string( ch->in_room->room_flags, r_flags ), ch );
				send_to_char( "]", ch );
			}
		 }

      }