I spent 2 months, June 12-August 12 at the King GH, my second stay, first was Feb. 2010, also stayed at their sister GH in Siem Reap in 2010.
During both stays I found the staff very pleasant & helpful, most had passable English skills while the desk staff & manager were very good. They very helpful at everything, from getting a visa extension, to showing you where to get a haircut or a button sewn on a shirt.
As I arrived late in the evening without a reservation, the only room available was a windowless one on the 2nd (3rd to North Americans) floor. However the next morning (as promised) I was moved to a bigger one on the 1st floor. Rooms were basic but clean with shower/toilet, complete with towels, soap,toilet paper, tooth brush, cable TV & in-room Wi-Fi . They were cleaned on request during my stay. I just had a basic fan room & the absence of hot water was not a problem as I don't have hot water at home in El Salvador. There was also a no smoking in the room policy, which was pretty much followed during my stay.
I have noticed reviewers complaining about the lack of some of the above amenities, one must remember that this is the tropics in Asia where things work differently than the west, so if something is missing just ask & it will be cheerfully provided.
The location was great with other restaurants, tailors, barbershops, printing/photocopying & a photographer for visa pics all in the same block. Central Market, bus station, hospital, banks & ATM's a 10 or so minute walk one way, with the Old Market, the Night Market, Riverfront restaurants & bars the other.
The on-site restaurant was good & fairly priced, as to service, see above about it being Asia, as if busy it could take awhile as they might have to go to the market to restock with fresh baguettes or fruit, no biggie.
Guests are treated like family as when the "Princess" oF the GH celebrated her 4th birthday, all guests present received a piece of cake, spring rolls & a free beer. Cool!
With 4 tuk-tuks there was normally no wait for one to take you where-ever you wanted.
To save hassles for yourself & the King, if possible book ahead, as there are days when it's a full house, if something's missing, ask. Pay for meals when done, don't run a tab as errors can happen & the person you dealt with might not be present when it's time tp pay. I usually prepaid for the room 3 days at a time.
Only complaint I had was, not the fault of the GH, as Cambodia is lax on the no smoking laws, is the inconsiderate guests, mainly from the west (that should know better) who insisted on smoking at the tables.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC