Anonymous wrote:OP, I have a kid with an ASD/ADHD diagnosis and live on Capitol Hill.
Unless they think their kids can't be mainstreamed, they should just buy or rent inbound for one of the desirable nearby schools, which include Brent (best overall reputation, but most expensive real estate), but also Ludlow-Taylor, Peabody/Watkins, and nearby Vanness.
I also agree with an above poster that the best overall nearby school for mainstreamed kids with SNs is School within a School, though the child would need to get in through the lottery, which is near impossible. (That said if the older has a HFA diagnosis then they may be able to enter SWS specialized program.)
I would add Maury to this list of well-regarded Capitol Hill elementary schools. Some of the housing there is a bit cheaper (still expensive though)! The commute is a little further but still a very reasonable drive. For Peabody/Watkins, it seems the kids in the OP will be in PK3 or 4 and 1st or 2nd grade next year. This means the kids will spend several years at different schools, which could be less convenient. I'd prioritize the other schools for that reason, but if they found a place IB for the Cluster that worked for them, wouldn't rule it out unless they hate the double drop-off.
Talking with principals and school psychologists in advance about how the IEP will transfer could be useful in figuring out which school to prefer, but there is a lot of turnover in DCPS and it's likely that some of the people in these positions will change over time. If you're looking for more charter suggestions, Two Rivers and Inspired Teaching School might be worth considering as well.