It was the first time I used Airbnb, and I couldn't have had a better experience. My girlfriend and I stayed at Clara's apt for a week and we LOVED IT !
First of all, Clara is a very sweet girl. She made herself available 24/7 for any doubt we had, and she was perfectly on time for both Check in and Check out (not 5 minutes before, not 5 minutes late).
The apt is very cosy and comfy, clean and new. Heating worked as it should, as did other listed features. Location is awesome. Taxis and buses are just downstairs, and train / subway are 2 blocks away (there are 2 stations 2 blocks away to each side). Lots of cafes near (we chose a different one for every morning).
When we go back to Bs As (and we def are, because it's such a great and beautiful city), we surely are going to contact Clara again. Very well recommended !