This is a lovely duplex apartment and I thoroughly recommend it for the kind of space that has been prepared for the guests.
Everything is thoughtful, every detail, including what is left in the cupboards and in the fridge for the ones among us who like to cook (nice coffee, nice organic spices, a little bit of olive oil, the choice of kitchen utensils etc.), or in the bathroom (organic shampoo, nice soap etc.). Not only functional but lovely and welcoming.
People not familiar with NY may want to remember this is not Harlem as around 125th St but Spanish East Harlem. Interesting differences.
It's fairly easy to walk to the subway (line 6 is just over 10 mn walk away; line E is roughly the same distance).