My rating reveals it already but I have to say it again: I did not enjoy Every Day as much as I initially thought I would. The whole concept of the story sounds promising and I liked the short stories of the people A inhabited but I did not like the plot as a whole. 
 Rhiannon the love interest of A was in my view too shallow and I thought their love story was to rushed. I mean who falls in love with someone after one day. That is overexaggerated and he didn't even know her much. They just spend one day at the ocean and she came across sad and lost at the same time. That is not enough for me as a reason. Call me a realist but it wasn't sufficient for me. 
 I didn't like Rhiannon at all as a person. She seemed calculating and I never felt that she honestly like / loves A back as much as he loved her. I did like A. He/She/It was really likeable but only up to the point when he stopped caring for the persons he inhabited and only recklessly used them to see Rhiannon. 
 The how was also never explained. I get that A hasn't a clue what's going on with him but I really wanted an explanation why he is no more than 4 hours away from Rhiannon and why he only inhabit people his own age. Levithan tried to explain it while he let A suggest Rhiannon to move to NY but it wasn't explained in depth. 
 I did like the ending though. For a little while I was afraid A will actually do something stupid with Alexander but I loved his choice in the ending. 
 All in all I think Every Day is a nice stand-alone book to read but it wasn't as good as I hoped for it to be. But it was okay.