My boyfriend and I had a fabulous 4 month stay at Irazema's apartment. The location cannot be beaten - it's in the heart of Roma Norte, and an easy walk to both Juarez and Condesa. It's also very close to Plaza Rio de Janeiro, which means lots of great food nearby! (Including the famed - and delicious - Rosetta Bakery.)
Irazema is a fabulous host. She was very responsive and helped us immediately whenever we needed something.
The apartment is wonderful, and the couch, bed, and other furniture are comfortable and great quality. There is great water pressure and plenty of hot water, and we had no issues with internet while we worked there. In fact, the wifi is very stable and fast!
Just one thing to note - the laundry is on the roof top, but you have your own private laundry room dedicated to this apartment unit - which is fabulous! It was so nice to be able to do our own laundry during our stay.
I highly recommend Irazema's apartment if you are looking for a home-away-from-home in Mexico City. :)