I recently stayed at Hosteria San Carlos when I had an overnight layover in Quito prior to returning to Cuenca. My flight was due in at 1050 pm, but was almost 2 hours late, yet a driver from the hosteria was waiting for me. Believe me, I was very glad to see him!
The hosteria accommodations are simple but very clean and comfortable. The grounds are very pretty and well maintained. The staff is extremely friendly!!!
Whether staying just overnight between flights, or as a base to explore Quito and surrounding area, I highly recommend Hosteria San Carlos!! I consider a great value.