There is only two of you, and you may have differing priorities. You might be looking at the place long term, wanting to upgrade mechanicals/landscaping/roofing etc, the other person might be looking to get out in the next year or 3 to get more space in the burbs so just wants to band-aid everything.

Things like putting in solar or doing electrical work to get an electric car charger are two areas I can see where things could be tricky in a two person condo if you aren't on the same page.