Under The Stairs

 Rarely used stairwells can be havens

Human people don't like to go into the lowest part of the stairs, especially at night.

The stairs echo loudly, and you will be warned if anyone approaches. Likewise, you will be heard if you are very loud. Although the echo is fun, refrain from screaming in the stairs.

Parking garages and other buildings that are permanently open to the outside are often the best places to seek some quiet stairs. 
There are few long lines of sight here. 

Be careful not to get backed into a corner when you hear someone coming.

While you need to keep an eye out and ears open while you are here, these places can offer moments of calm and solitude.

The clever fox knows:
Stairs with exits that lead to the outdoors allow you to make a quick escape.

Rain

The rain is a good daytime companion

When it rains, humans are usually much less interested in being outside, which means they'll be less interested in urban animals and our activities. Mild storms make for great cover.

This is the perfect opportunity to move around during the day. This can sometimes be a better time to find food that you don't normally come across, since some human places that have food are only open during the daytime.

A rainstorm comes with many dangers, whether during the day or night. Humans in cars can't see you as well, and may not even attempt to avoid you on the road. The sewers fill up with water, making a useful hiding place into a death trap. 

The clever fox knows that rain is a clean source of water in the city, and will seek out places where it collects, such as on parked cars, in garbage cans, and within the holes in damaged roads.