Clicking the link took you straight to their front door, where a bowl was sitting and waiting to perform its duty of holding dem keys.
Today was the first day someone was meant to arrive, and the site has since been updated to include a set of keys. Each day will supposedly see a new guest arrive, up to April 1st.
March 26th (posted way late):
Def' Brock Samson's keys.
Name's Ash. Housewares.
My guess is this is related to the new Poker Night game or a similar type of Telltale Goof-off side project, or a really elaborate April fool's day hoax. We'll find out soon enough.
EDIT: SPOILERS HERE DON'T LOOK IF YOU WANT TO KEEP GOING WITH THE MYSTERY