What are requirements for a micropub? So my question is what are the requirements for micropubs?
Are there any specifications on room size, interior, beers, staff?
Has anyone got experience in setting up and running a micropub and can give more insights about what are key factors?
Young in terms of establishments - Micropubs "traditionally" have to adhere to certain "standards": 

There is only one room
Generally too small to have a bar
No Televisions
No Juke Boxes
No manufactured (think commercialized) beer
No lagers! (Literally is a dirty word - think yelling a racial slur among the people associated with that slur)
No spirits (usually just Wine, Ale, Cider - though soft drinks and water can be supplied for children and DDs)  

The focus is to shun electronics (outside of electricity) focus on social interactions and ales (and maybe sometimes pub snacks).  

This seems to be a very United Kingdom centered movement (as I havent heard of this in the US).