Looking for our first home: Questions to ask

My husband and I are starting to look for our first home. From my internet browsing, it seems that we’ll end up in a brownstone floor-through apartment. Any suggestions on red flags to look for or standard questions to ask when we go to open houses? Searching the forum I’ve come up with:

When was the roof last redone?
Are the electrical and plumming redone?
What type of boiler/heat?

Many thanks in advance.

By fawn |