A simple player home that I originally made for myself because other house mods I tried either were too much or too little. 

I wanted something simple so I could decorate it myself and I wanted it near Megaton.
As it is not actually in Megaton, it doesn't seem to interfere with or be interfered with by mods that modify Megaton (at least the ones I use).  If you have a mod that modifies the area around the main gate at Megaton, this might cause a problem.  If you blow up Megaton I have no idea what happens to this mod as I've never tried it - but if you do blow up Megaton then you can't get the key anyway (Its the one you get from Lucas Simms for the Megaton Player House).

I tried to think of what I'd want in a vault if I had found myself in the circumstances of Fallout 3, but also because I like to collect items (pretty much OCD when it comes to collecting items) I needed a "trophy" room to display what I have collected.
About the only thing not in the vault that I wanted to put in to it is a washer and dryer.  Reason, the ones I tried to model looked like crap and there isn't any in any modders resources that I could find.  If I get better at modelling, perhaps I'll add them.

There is a workbench and a medical healing station; a number of storage containers, but not a whole lot more. This is because I use other mods that aid in decoration and item collection. Mods that motivated me to make a house are;
Mannequins - http://www.nexusmods.com/fallout3/mods/2060 - by Andyw1384
Wasteland Furniture - http://www.nexusmods.com/fallout3/mods/16065 -  by Smokindan
Portable Animated Fans - http://www.nexusmods.com/fallout3/mods/11665 - by Razorwire
Placeable Lights - http://www.nexusmods.com/fallout3/mods/13490 - by Ares1
Feng Shui - http://www.nexusmods.com/fallout3/mods/11532 - by HugePinball
Mothership Zeta Lootable Statics - http://www.nexusmods.com/fallout3/mods/8534 - by CMF (requires the Mothership Zeta DLC)
Decorative Items - http://www.nexusmods.com/fallout3/mods/19361 - by Jokerine
Gilbert Science Sets - http://www.nexusmods.com/fallout3/mods/19000 - by Jokerine
Pickupable Hulagirls - http://www.nexusmods.com/fallout3/mods/13571 - by Ulatec
and the mod that made me want (and need) a trophy room;
DCInteriors Project  - www.nexusmods.com/fallout3/mods/5573  - by chuckSteel (requires all DLC)
I also use (and recommend);
Precision Collision - Clutter - http://www.nexusmods.com/fallout3/mods/19949 - by Ste41k
More Food - http://www.nexusmods.com/fallout3/mods/18183 - by Laulajatar

Some of these require FOSE and if you don't have it installed, don't expect it to work for you.  If you are not using these or similar mods, then this may not be the house for you as it is pretty barren and very simple.

Note that this mod does not have a bobblehead stand.  Main reason is I dislike the ugly vanilla one and the one I modelled looked worse than the vanillla one. Fortunately, there is one for sale from Moira and it is one that I prefer and use because of its simple elegance.  It comes with FO3 Wanderers Edition by FWE Team - which if you don't have the FWE mod installed (and a few others as Martigen's Mutant Mod (MMM), Weapon Mod Kits (WMK), Project Beauty and Energy Visuals Enhanced (EVE), to name a few) then the lack of a bobblehead stand is probably the least of your concerns.
FO3 Wanderers Edition (http://www.nexusmods.com/fallout3/mods/2761)

Oh yeah, I added a fast travel map marker to the mod.  Kellena insisted I do this before putting the mod on the Nexus so thank her, not me.

Install:
Copy the MegatonVault.esp file from the archive to your Fallout3\Data folder.
Activate the mod.
Or (preferably) use a Mod Manager to install.

Uninstall:
Remove any items you wish to keep from the house. Go outside, save your game and then exit Fallout3.
Deactivate the mod.
Delete MegatonVault.esp from your Fallout3\Data folder.
Or (preferably) use a Mod Manager to uninstall.

All the assets used in this mod are readily available in the GECK with the exception of the light switch script which I got from a youtube video tutorial. While I do appreciate, like, have used, and was severely tempted to use (I'm looking at you Jokerine) resources that modders place on the Nexus for others to use, I didn't use any because I wanted to keep the house clean and fairly simple to allow it to be decorated the way someone wanted to decorate it, either in game or via the GECK.

If someone wants to use this in another mod they are creating, please, feel free to use it.  Just send me a PM so I can take a look at your mod when you upload it.