Here is one of the series of reviews about airport lounges.
As the second review, I'm going to introduce JAL Sakura Lounge in domestic terminal at Haneda Airport. 

 
To be honest, there is not a big differece between JAL Sakura Lounge and JAL Diamond Premier Lounge that I introduced for the first review.
(this is because those lounges are in domestic terminal.)

so in terms of facilities, both lounges have the same kind of ones.

However, when we look at drinks, Sakura lounge provides rather less premium service than Diamond Premier lounge. For example, Diamond Premier lounge provides more variety of beers and whiskeys.
In addition, there is no tasty bread at Sakura lounge that I could have at Diamond Premier lounge.

There is not so many people if you go there in an early morning like 7am.

(I didn't take any photos because it looks the same as Diamond Premier lounge)

Location