The entrance to this location is found in the end of a short alley. In the ground floor, there’s a Novice locked door to the left which leads to the kitchen. There's an Armor workbench in the NW. The doorways are rigged so watch your step.
Go through the wall in the NE then make your way down. Once you’ve reached the basement, you’ll find more ritualistically mutilated bodies and more loot containers. There’s a chem station nearby as well. Go through the tunnel past the pile of bodies then continue heading deeper.
Once you reach the part where you have to jump down, there’s a first aid kit in the end of the second ledge. Drop down to the bottom and take out the two raiders in the next room.
After that room you’ll find a Novice Safe in the alcove to the left. Go upstairs then follow the path until you have to cross the pipes as a bridge. Move along and you’ll find a couple more raider guards with a turret alongside them. Wipe them out and continue forth until you finally reach a man named Pickman surrounded by raiders Lead by Slab.
Kill all the raiders and talk to Pickman. He’ll give you Pickman’s Key so you can use it to retrieve your reward for saving him. This will also give you the quest, “Pickman’s Gift”. Before you leave the room, there are two important collectibles you should get hold off first.
The Lockpicking Bobblehead is found on the ground, beside the pillar and burning trash bin in the middle of the room. Next, an issue of Astoundingly Awesome Tales on the ground where Pickman was standing earlier, directly in front of the green steamer trunk. Continue through the next tunnel and you’ll reach the ladder to leave this place.