I have a 16 month old DS and a 3.3 year old DD.
DD goes to nursery for 3 hours a day which breaks the day up a bit but it's still so so boring! I live quite rurally which doesn't help
DS has started having the most horrendous tantrums (head banging, screaming, hitting, making himself sick ect) which is hard work.
The DC are just constantly fighting and arguing. Every five minutes I'm having to pull them off each other!
And of course it's nearly I'm possible to get any housework done.
It sounds awful but they can be so loving toward each other. They are always hugging and giving each other kisses. I don't regret the age gap at all.