This was very easy to assemble, took my wife and I about 45 mins. We ordered a king. 
The particular bed we received is darker than it appears in picture, which was a slight bummer because it doesn’t match our end tables as well as I thought it would. But it’s still nice. 
The mattress we have is slightly too large for frame and it hangs over by about 12 inch. But so far that hasn’t posed any problems.