water purification tablets (can get it from Kathmandu and buy some altitude sickness and indigestion pills.... just in case).
Purified water tastes yucks but add a little Tang Orange or flavor of your choice and it's much more palatable.
The guesthouses are pretty well maintained - since they belong to Nepalese/Sherpas with rooms to spare. The outhouses are another matter. LOL... back in 2004, they are made of granite stones with large gaps in between. No flushing system, so what you get is basically wooden planks laid over a 7 feet pit. Temperature is very cold so there's hardly any smell but the visual impact is.... hahahahahaha... let's say it opens up a whole new visual horror. Don't bring your camera into the outhouse. :P
Oh... I can't resist. Here's another photo of Lhotse - tell me what you think?