Kids close in age

I'll just get straight to the point here, my partner wants to try for another baby before he gets to old go enjoy being a dad, I have a 5 year old from a previous relationship and we have a 7 month old together he wants to start trying when our youngest is around 1 year old, question is

how hard is it having two kids very close in age? What's it like?

ill be watching them on my own most of the time the 5 year old is absolutely fine hes brilliant with his little brother and tries to help all the time, but my partner is self employed so he obviously works most of the time, im also self employed but it's a bit easier for me as I work from home as a photographer so money isn't much of an issue

Would you do it? Or would you like to wait longer? What's the pros of having kids close in age? Or cons?

Thanks guys any help is much appreciated