This is part of Nick Valentine’s companion quest, “Long Time Coming” after completing all 10 Eddie Winter Holotapes.
This is a raider outpost so prepare to fight some amply-armed raiders. There's a cooking station and chem station in the ground floor, in the upper floor you'll find a weapon station. There's an advanced wall safe behind a counter as well.
Inside the station, there's an Advanced floor safe and Expert door with a protectron. Head down and kill the raiders. There's an Expert safe in the western side of the station, near the bed.
There's a weapons workbench behind the advanced door and more enemies inside as well as another cooking station. Continue north of the tunnel then enter the Hole in the Wall. Follow the straightforward path until Nick leads you to Eddie's bunker's entrance.
Let Eddie and Nick talk to each other. Once done, kill the *******. Also, don't forget to loot his unique gun, Eddie's Peace. There's also an Expert Safe and Expert terminal in the room. The terminal is used to open the safe. The holotape, “To Claire” is found on the cabinet beside the bed.
Head outside and continue to the next room, what seems to be a bar. There's a named raider there called Chancer. Kill him then find the hidden button behind the cabinet to open the security door. This gives you access to the steamer trunk and chem station inside.
Go upstairs and and grab Joe Spuckie's basement key. Use the ladder to exit to the Joe Spuckie's sandwich shop.