quick - need a tapas/small plates spot in the 20s btw 5th and 6th!!
going for a drink after work and want small plates of something delicoius, any cuisine will do
Bar Stuzzichini - Bway b/w 21st & 22nd
Boqueria - 19th St. b/w 5th & 6th
Sala One-Nine - 19th St. b/w 5th & 6th
El Quijote - 23rd St. b/w 7th & 8th
Pipa - 19th St. b/w Bway & Park Ave S.
there are some more good places farther outside your requested location...
I would add Lunetta to the list. My favorite out of the six would be Boqueria and Lunetta. Both are very high quality.