The Machine room is located during Puzzle number 88, The Frog's Path. You get there after solving puzzle number 133, Grab the Key, then Puzzle number 134, The Steam Room. I have added links to these Puzzles under related questions below the answer.
Photo differences, Machine Room.
Please see the Related link below for a walkthrough of the puzzle.
During your journey through Herzen Castle you will come across the Machine Room, you will also come across this room when you answer puzzle 88 The Frogs Path.
Gressenheller
Sammy is outside the Hotel.
Answers for Professor Layton and the Diabolical Box can be found at the related link below.
Professor Layton and the Diabolical Box Characters. Please see the Related link below.
Sorry, Wrong game! there is no Lobster Restaurant in Professor Layton and the Diabolical Box.
Professor layton and the lost future
Professor Layton and the diabolical Box. Location: Machine Room. Where to take photograph number 9. Please see the related link below for a walkthrough of taking photograph 9.
To see a complete walkthroughof Professor Layton and the Diabolical Box, click on the related link below.
It is the theme of Professor Layton.
For a walkthrough of Professor Layton and the Diabolical Box, click the related link below.
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Professor Layton and the Diabolical Box. Please see the related link below for a walkthrough of the Character Profiles.