Feel free to contact me anytime. I try to accommodate my overseas clients in different timezones as much as possible. I do work late at night, but I am but a man, and sometimes I do need to sleep.
Email is the best way to contact me. If I do not reply back within an hour during daylight hours in the GMT+2 timezone, then your mail didn’t reach me.
If it is night time here then replies might take till the next morning to get answered. Just make allowances for that.