First of all: Tom, the owner, was super kind and thoughtfull . Answered very quickly any question I did. He even offered to call a car for my return to the airport. Also very respectful concerning when the maid could go to the appartment and clean it.
About the location: the area is very nice and safe even at night. There are several subway lines (4 and 5 blocks from the appartment in each direction) including an express train which took me to lower Manhattan in 15 minutes! Also there are several small groceries really close and a mini market which will be enough for your daily meals. Besides, on Amsterdam and also on Broadway Aves. you have lots of little restaurants (my favourite was "The Grange" ).
The appartment: the pictures you see are trully what you'll meet, except that it is bigger than what it looks! Super confortable full bed; beautiful bathroom; very cozy even with below cero temperatures; very clean (maid goes every Friday and changes towels as well as bed linen + cleans and organizes everything); you have dishes+silverware+cups+etc of very good quality; coffee+tea+sugar there for your arrival.
Take in mind this is a basement studio, so no windows and you have stairs till you get to the appartment itself, but nothing to be worried about.
Finally I'd like to say how pleased I am to have rented this appartment, it was a big bonus for my wonderfull holidays in NYC !!!!!!!!!!!!!!!