Although the location seems to be small and not too interesting, this is not the case. Right at the entrance, you can run into an alarm trap that wakes up all of the ghouls in this location and there are quite a few of them here. At the very top, watch out for the Glowing One that is capable of reviving all ghouls within his sight.
At the ground floor, on the counter, you find an issue of Unstoppables, Grognak's Axe behind the counter in the glass cabinet, and a storage key for the storage at the back of the shop and to the safe hidden in the blue register.
At the top floor, you find the costume of Silver Shroud, which you need for quest Silver Shroud in Goodneighbor (behind the curtain, there also is a dedicated gun).
In the corner opposite the door to the record room, where there is the above costume, in the locker in the corner, you find Grognak's costume,
In the green crate at the top floor, by the door with a star, there is a fusion core and a light sensor (quest Quartermastery for the Brotherhood),
At the top floor in the toilet, there is an issue of Astoundingly Awesome Tales,