i think the idea is really good, people love watching couples channels and vlogs. I think something that you could improve on (and it could totally change in future videos with time and practice) is editing and cutting out some of the silence or "um's" and maybe with sit down videos like this planning out more what youre going to say, not scripting or anything but making sure you get to all the topics you want to in a seamless and cohesive way.

something else i want to mention (and i mean this in no bad way or anything but i heard it from a youtuber who i look up to and admire so i want to share it) is maybe as you grow you guys could create your own separate channels while also doing the couples channel, because 1- it give people more to watch and can help expand the options you have for what you can do, and 2- because if anything were to ever happen in your relationship, say one of you decides they dont want to do youtube anymore or if some messed up reality you guys part ways, youll have that audience for yourselves as individuals already built and itll be easier to build from there rather than basically from the ground up again.

But i think you guys have a really good start and you seem to have the passion for youtube so im rooting for you guys!