As a previous hotel employee here are my tips for getting an upgrade:

1. Be extra nice, and make sure you are sincere when you ask the front desk agent how they are doing

2. Possibly sign up for HHonors....(not required)

3. be straightforward and ask for an upgrade, if you are already a HHonors member PLEASE DO NOT try to use it and say "well i'm a platinum member, i DESERVE an upgrade" stray as far away from those type phrases as possible!

4. ENJOY your upgraded room

Wish i was in NYC this weekend, definitely would have loved to see the famous 4.6is--have a good one

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BMWCCA