Wi-Fi connection is generally OK, but can get sluggish occasionally; General surfing for work is fine, but don't count on large downloads. It also auto-resets every 30 minutes so you have to click on the page that pops up to re-activate it.
Across the road from Marina Bay, The Esplanade and Esplanade Park (good for a walk to stretch your legs). A short bus ride down to the Orchard Road (shopping area). Also a 10-minute walk from Raffles Place MRT and the surrounding offices (that's part of the business centre).
Open until midnight on eves of Public Holidays (like it is on Fridays and Saturdays). Bright and spacious place to work, with average coffee shop murmur. Music is generally at volume that doesn't interfere with conversation.