With this simple tool, you can launch your Portal 2 maps instantly without having to start Portal 2, enabling the console, typing "map mapname" & hitting enter. All you have to do is specify where your Portal 2 standalone .exe is located, then, after your map is installed properly, you can enter its name without the extension into the second textbox. Finally you can enable the console or specify extra parameters yourself. Then just hit the awesome launch button & enjoy the map!
An extra...