I would like to share some advise and news from Ethiopia where I spent a couple of weeks between December and January 2015.
I would not recommend the Itegue Taitu hotel. The single room was quite dirty and with no hot water.
I would recommend Michael Hotel. It is clean, there is a wifi free, hot water and a fair price (300 birr for a room with twin bed)
I would not recommend the tour operator “Siemen_Trekking”, especially to a single traveller women.
Generally speaking, Gondar was the only place in ethiopia, where I didn’t feel safe.
I would not recommend the Atse Yohannis Hotel. I spent there two nights, in two different room, and both where not so clean, very old structure. I also had a reservation but they completely ignore it and I had some problem in finding an available room.
ETT Tour Operator is good, altought we had a problem with the car (air conditioning) while we were travelling towards Erta Ale. Be sure the driver will check the air conditioning system before leaving Mekele and always ask for the newest model of jeep (there are more then one).
We had a reservation at Alef Paradise. Altought the reservation was reconfirmed the day before our arrival, when there, there was no room available. Had to change place, stayed in The Villa guesthouse. Very Good accommodation.