My elder 2 are 24 months apart, and as others have said seeing them support each other is lovely - I so love seeing them approach a situation hand in hand because neither is brave enough to do it alone (they are 4 and 6). They look after each other, stick up for each other, cuddle each other they love each other, help each other with decisions that are important to a 4 and 6 year old but that I have dismissed unthinkingly because I am cooking dinner or whatever... They also fight of course, but the good far outweighs the bad so far.
The only thing I found harder with 2 was breast feeding really, as my dd was a master of creating situations which meant I had to get up and help her every time I latched DS1 on, the posts on forums telling you you could cuddle and read to your toddler while feeding your baby, or have a box of special feeding time only toys and snacks, and that would keep them busy, always made me laugh hollowly.
I kept the focus on DD when DS1 came alone mainly though, as babies only need love, warmth, food, a safe place to sleep, whereas toddlers actually need focussed attention - so DS1 spent a lot of his early babyhood in a sling, and DD and my life continued almost as before. I have found this much harder 3rd time around as the demands of slightly older/ school age children seem actually less compatible with a baby (homework, more ferring around and activities not designed for small tots etc) than those of a toddler, but that is irrelevant to this thread!
Congratulations and good luck!