First, know thyself: What kind of work and workplaces have I loved in the past and why? Was it the people? The close-knit feeling of a small firm? The opportunity for creative thinking? The great benefits? The fantastic mentorship or exciting clients? Once you get that crystal clear in your mind, dedicate yourself to asking for it - and don't compromise.
Next, consider your future. You might love working with a room full of 20-somethings, but how many of them ...