My flight from Diri Dawa to Addis Ababa is today at 16:00. I was going to take the public minibus from Winta Hotel in Harar to the airport in Diri Dawa in the morning but I ran into a Japanese tourist who had a private minibus. I paid him 20 USD to share his ride to the airport, about an hour away.
We left at 09:00 and got to the airport in record time at 10:00. I thought about changing my flight from 16:00 to 12:30 but there was a huge line at the counter so I didn't bother. They would have probably wanted me to pay more for the earlier flight since it was more expensive than my ticket.
The flight to Addis Ababa was smooth and fast. My hotel was close enough to the airport that I could walk to it. I walked out of the airport and across a big street to find the Zenbaba Guest House. It was about a 15 minute walk. Of course, the hotel wasn't at the map location specified on Booking.com. I had to find a place with WiFi and then call the hotel via Skype to find out where it really was. They sent me a WhatsApp with the real map location and then I found it easily.