One nursery "luxury item" you couldn't live without!!

Jessica • 29 years old, in love, and married. Mommy to Lucy born in March 2016. I am complete.
To all of the experienced moms out there- help a ftm. I THINK our nursery is ready, but I'm not sure we have everything. We want whatever will make things convenient and easy to adjust to.
What's the one special item that you have for baby that you couldn't do without??