esp8266-01 and GPIO2 for 5v rele activation

Thanks!! I didn't know that about the debugging.... I will buy a ESP8266-12 as you have suggested.

By 'end' I just meant that the decoupling should be put as close to the esp8266 module as possible. If you put it for, example, near the converter and still had leads between it and the esp8266 then it would not be so effective.