Someone once asked...
Someone answered with kindness...
Depends on what type of man to be honest, there's not a clear direct answer and it'd be the same for woman or any other person, but if I were to say... liking similar interests or expressing the same enthusiasm with them. Well that actually applies to everyone, so. If you are trying to figure out what makes someone happy you should try asking them or observing their behaviour and figuring out what makes his mood go up.