Pax Y.
Yelp
I lived here for two years until spring 2014 and moved out.
Pros: A great view of the Hudson. Steps away from the Hudson River Greenway. You can walk, jog, run, bike, skate, etc. there along the river.
All the doormen and handymen are helpful, responsive.
My unit was clean. No roaches, no bedbugs, other pests.
Cons: Noise from construction sites. There are two. Work -- noise -- can start as early as 7 a.m. This was really irritating sometimes when I wanted to rest in the morning. Both sites are not finishing anytime soon. The leasing office did not inform about it. Perhaps my fault for not asking.
It also sits on a zone 2 hurricane evacuation zone. We did not evacuate for Hurricane Sandy of 2012. Zone 1 was subject to evacuation. I got a robocall telling me not to flush toilet in the apartment because water supply was suspended. It got fixed within a day, I think.
The Helena stands on a very low-lying area, unlike other apartment buildings nearby along the river that stand on an elevated land.
http://www.nyc.gov/html/oem/downloads/pdf/hurricane_map_english.pdf
The gym closes early at 10:30 p.m. weekdays, 8 p.m. weekends. You needs to pay $50 or more per month, not included in the rent. I usually came home after 10 p.m. so, it was useless.
They have a bus in the morning to Columbus Circle subway station and can be handy. I used it sometimes. It runs every 20 minutes. From the station, I've never taken one. It only runs limited hours in the morning and evening on weekdays.