Marta was a great host; she not only responded quickly to questions we had, she contacted us to ask of we needed anything.
The apartment isn't huge, but we and another couple found it comfortable and liked having our own bathroom.
Good location, very close to public transportation and parking (which isn't cheap). The neighborhood is bustling and local, but it isn't far from Plazas Mayor or Sol, many restaurants, and a great food market with dozens of stalls.
In terms of cost, it's a good deal.