Gowanus_G, I rented a garden level in a brownstone about a mile from there for three years. Not a basement; half below grade at the front, full garden at the back. My honest take: it can work, but the inspection matters more than the lease.
Things to do before you sign:
- Look at the baseboards in the front room. If they're newer or painted extra thick, that may be covering old water damage or pest gaps.
- Run the water in the kitchen and bathroom for five minutes. Garden levels often have floor drains and sump pumps. Ask where the sump pump is and when it last ran.
- Check the apartment for trap door covers or a floor cleanout. If the cleanout is in your unit, that's where sewer backup shows up first.
- Ask who clears the areaway. The landlord may say "we do," but on a block with big trees, it's a weekly fall job.
Mice are not a guarantee. I had one mouse in three years, because the building had a basement cat and the trash cans weren't by my windows. The bigger issue was moisture. I ran a dehumidifier from April to October. That kept the musty smell away but added to the electric bill.
Security is overhyped compared to a second-floor unit, especially if you have window gates and an inner door to the garden. But don't put a desk facing the front window and leave a laptop visible. That's just common NYC sense.
If the building has old radiators and one-pipe steam, being on the garden level can be great: the boilers in the basement push heat up, so the lowest floor often gets the hottest steam first. Summer is the opposite, but a garden unit stays cooler than the top floor.