This is a guide to opening the safe in Beauty Within in the Stonemarket in Thief 2014.
Getting into Montonessis Abode: http://wp.me/p1SfP0-1Hk
All side mission guides: http://wp.me/P1SfP0-1Hf
All Thief guides: http://wp.me/P1SfP0-1FJ
Getting Into Miss Scarlett’s Townhouse
Go to the objective marker and look for a beam that you can attach a rope arrow to:

Attach a Rope to this Beam to get into Miss Scarlett’s Townhouse in Beauty Within in the Stonemarket in Thief 2014
Use the rope to climb up and go into Miss Scarlett’s Townhouse. Take out the man walking about or be sure to avoid him.
Opening the Safe
Take the booklet next to the bed:

This Booklet contains the Information to get into the Safe at Miss Scarlett’s Townhouse in Beauty Within in the Stonemarket in Thief 2014
Then go into the cabinet in the lower room and look for the code scratched into the wood to your right in the cabinet:

The Code to get into the Safe at Miss Scarlett’s Townhouse in Beauty Within in the Stonemarket in Thief 2014
Move the painting on the opposite wall to uncover the safe.