I like when I read reviews in which guests compare and contrast reality with their expectations, rather than just give a description. Anecdotes help! So, "I expected to be blown away by the size of the king room based on the pictures, but there was only 4 feet on either side of the bed" really helps me understand what was delivered.
Most importantly, if you ramble on (and there's nothing wrong with going into detail), divide it up into paragraphs. I skip over reviews that are one giant block of text
