Yes this is Steatoda nobilis. There are shy & skittish usually, if it is disturbed it will most likely bolt for cover. They tend to stay high off the ground in areas with a lot of "through traffic", but can be found sometimes at ground level in quieter areas. Bites are usually the result of a spider being crushed against the skin, a spider you can see high up on an outside wall poses no real threat. They are territorial, not great travellers and tend to be fairly spaced out, I have seen adult females and maybe a young spiderling in fairly close proximity (occasional males for short periods earlier in the year), but they don't live in nests, or colonies.
I don't tolerate them in the bathroom, or bedroom, but I don't mind established females, if out of the way, in other parts of the house. Males I put outside (unless they escape whilst having thier mugshot taken in the living room).
Females tend to hang in their webs in the evenings so are usually fairly conspicuous & easy to avoid.