Stay here. Period. End of story.
The area is Condessa, which we only had heard was a nice area. Being this is Mexico and we weren't using a travel agent, I was scared, to say the least, where to stay. All I heard about was the violence and the Mexican's robbing people. Well, we didn't see any of that, but you do need to be on guard and be careful where you go. That being said, this place IS VERY SAFE. In the pictures it looks like an alley to get to the unit, but it's a dead end street with a guard at the entrance with a gate. The guards are there 24 hours a day and do watch out for you.
Viadora also is very safe once you enter. You are given a key that opens the front door, there is always a concierge there to greet you and answer any questions you might have. Some don't know much English, but they find a way to communicate. We did use Google Translator when we didn't help. Erick is the house manager and he is beyond helpful.
The units are great. We stayed in 105 and this I completely recommend. It is on the top with a view of the city and it was large enough for us and our 32 year old daughter. We did switch rooms when she left and went to 101, which is on the bottom. This is much smaller inside the unit, but you do have a patio to enjoy. Stay upstairs if you can.
Overall, we are defiantly coming back. No question. It is close to restaurants, the Roma area and fun little cute boutiques. It is clean, up to date and the staff is there for you. Other Airbb's leave you on your own without security or someone who watches out for you. They don't do that here. It''s like a small hotel with a smile.