We've got a 16month gap, the little one is 2 months.
We have a double pram, (2nd hand mountain buggy) I live in a hilly area and the single didn't have air tyres there is no way I'd get it around with 2 babies weight on it, plus the older one isn't great with instructions and loves sitting in his pram for a rest on the way home from nursery. In the early days we played pretend outings with both strapped in the pram and walking around the house, little one learnt to sleep in the pram so I can just out her down now and it kept the older one involved.
Our older child has been sleeping in a travel cot since 8 months as he wriggles to much for a normal cot and kept waking himself up. The little one just would not settle in the crib so went to the normal cot at a couple of weeks old. Although they both nap outside in their prams, big one in the single still and the little one in the double. We also have another travel cot in the living room but could have managed without as the little one much prefers to sleep in the pram, also thats safer as the older one cant reach into it to stroke her/poke her in the eye.
The older one still goes to nursery, in the mornings, so we are only with both from about 14.00 to bed time, apart from learning to pick up the big one when you're already holding the little one it's not much different tbh. I try to stay out in the garden for an hour or so, until its time for a feed.
If I've got stuff I need to do I put the little one in her bouncy chair, and the older one either potters about by himself, or if I'm cooking normally he will get his highchair and sit by me to help. He knows not to touch the cooker and woodburner so if I'm feeding the little one he can be free to wander around the downstairs. We all eat at 5pm so we aren't trying to fit that in after the kids are in bed.
We both work PT so have a rota of jobs to be done each day/week/month, which works well for us and and we do a tidy of the toys as part of the night routine so whoever has the toddler does that while the other sorts the baby as they both go to bed at the same time.