Very cute apartment in the Hipodromo neighborhood near Parque Mexico. I think it's a great location -- there are lots of restaurants/cafes/shops on Avenida Amsterdam and elsewhere. Easy walks into Condesa and Roma Norte too.
One tip: when you first check in, you might be a little concerned that there will be too much street noise. It is actually much more quiet at night. A lot more people walk by during the day and early evening, but there aren't any bars or open establishments late at night, so the block becomes very quiet.