We stayed at Cortona for one night last year. I had booked a motel across from DL at a great rate, far in advance. When we decided that we could leave a day earlier, I couldn't extend the other motel, so I booked Cortona for the extra night.
It's a great motel. Large, clean rooms, large well-maintained pool, free breakfast. Would not hestitate to stay again for those reasons. But it's just a little far from the parks. For one day, walking was no problem. Not sure I'd want to do it for 4-5 days, plus mid-day breaks. But since you're mostly going to
D23 at the Convention Center, I think it's a great choice, assuming you can get a good rate.
HTH,
Bob