Gotanda is a major stop on the Yamanote line but it is decidedly down-budget compared to stops to the north and south. This means there are loads of cheapo options. Amongst the many budget drinking spots in the area are Botan (one of the chain of Izakaya with the cheapest beer in Tokyo) and Genka Bar.
A Guide to Coworking Spaces in Tokyo
Which Tokyo coworking spaces offer the best combination of facilities, price, and convenience?