I recommend Guillermo's place if you want to be really close to Reforma and Chapultepec. It is also not that far from Roma Norte and Condesa. I was happy to be near all of my favorite spots.
Our place was clean and Guillermo offered to have a service come clean the place which was amazing after staying for a week.
Wifi works well and good food is abundant. I recommend getting some tamales or pan from the guys riding their bikes around 8:30/9pm if you want a late-night snack.