I stayed at the Hotel for another 2 weeks (October 18 through November3, 2012). The service was excellent as always. They expanded the hotel and added a new wing with rooms that are equipped with modern amenities (Lights, bathroom, TV). A swimming pool is under construction. I have attached pictures. The rooms clearly are far better and way cheaper than what you pay at the Hilton. Also you do not pay for internet access nor do you pay for a generous servings of an all you can eat breakfast buffet. This hotel is excellent in its offerings and is cheaper than Hilton or the Sheraton.

This is my second time staying at this hotel. Very close to the airport and walking distance to restaurants and other local shops. Edna Mall is a block away so I walked to watch local movie and had a blast. I got my room through azebot.com with good discount, a site where they provide online reservation to Ethiopia. They don't seem to have a lot of selection, but I like the discounts and access to attractions information. I would stay at Harmony again.
You're right Biomedguy. I've heard the same complaints from people who stayed in lower floors. You want to be on the higher floors and ask for Window rooms. They may charge you a few dolloars more, but it is worth it.

Plus points:

1. Very Near to Airport and Mall
2. Clean Area
3. Good Rooms and Service.

Bad/ Needs Improvements:

1. Some rooms are very small so be careful if you get them
2. Food is not very great
3. Was value for money at one time but now increasing cost has taken its shine a bit.

I was regular there but now started looking at other options.

My room (201) had no windows was very noisy with LOUD music from the bar and no ventilation.
No wifi only ethernet in room.
The area outside the hotel is NOT safe, pickpockets everywhere (of our small group one had his cell phone stolen, another jus tprevented having his wallet lifted.
Breakfast buffet is excellent though.