In general, I need the following when tuning:

• A quiet space.  I can’t hear dissonance when the background noise is high.  When using the electronic tuner, the microphone also needs to be able to “hear” the vibrations without background noise for the most accurate tune.
• Space.  If I need to take the action out of a baby grand or grand, I need to put it somewhere to work on it.  In general, if you have sticky keys, misaligned keys, broken keys, etc., I’ll need to take the action out to fix the problem.  In a grand or baby grand, the action is the width of the piano and about 2 feet deep. 
• Light.  I’ll bring some lights, but the room should be bright enough for me to see what I’m working on.
• Electricity.  I’ll bring a vacuum to work on the bowels of the piano.  You’d be surprised at what I can find in the bottom of a piano.