Nyyrikki, that is part of the answer. And that part is partly correct.
So, can you please describe your answer a bit more? Then we can have a winner (maybe).
You touch Esmerelda and you die?
Yes, but there´s also something else you can (must) do there.
Think, it´s very obvious! 
there´s still something else... what may happen if you know what to do...
Those who have played Jet Set Willy, do know what I am talking about.
What do you need to hear? 
Grab items (jailbars) -> jump to ballroom above -> feet stuck in the floor -> unstuck by jumping
Hap´s right with collecting jailbars.
(yeah, and those bonuses about ball room were right too
)
The most obvious was not heard though: Willy rescues Esmeralda (obvious hint in room name!
) but these answers are enough for me. 
Only problem is that now we have three possible winners! 
I thought there must be MANY Jet Set Willy lovers out there, who know the answers, but I guess they were too shy to open their mouth.
By the way, did you know, that those few screens leading to "Rescue Esmerelda" (plus that screen of course) are taken from Hunchback! 
You winners may use your three heads (three headed winner?) and make one shared question.
Demonseed, I listened that Atari´s Jet Set Willy remix and that had nice eighties feel and sound! 
By the way, to cheer up MSX Jet Set Willy or II, just find 8-bit Atari´s Jet Set Willy music from youtube and play it during your MSX Jet Set Willy playing!
Great Feeling!!
I really hope somebody could port it to MSX somehow!
And then make Jet Set Willy hack which plays that Atari tune!!
I of course like the original MSX Jet Set Willy music, but you know, this Atari tune is just too cool!
By the way hap, is that a scene from your real life?

...from any of your boozing nights....?
What do you need to hear? 
Grab items (jailbars) -> jump to ballroom above -> feet stuck in the floor -> unstuck by jumping
I think DemonSeed answered the biggest part of your question, so it should be his turn... after he gets the following trivia right before someone else does
: Montana John and the Templar's Treasure has 12 levels, give the list of their titles. (like, level 1 is "The Dark Forest")
Ok, I'll take this turn...
1. THE DARK FOREST
2. THE TEMPLE ENTRANCE
3. THE RED TEMPLE
4. THE TREASURE CHAMBER
5. THE PIT
6. THE DUNGEONS
7. RENAISSANCE
8. THE GREAT HALL
9. THE CAVE
10.THE TOWER
11.THE ANCIENT PRISON
12.THE SPIDERS LAIR
