If we talk specifically about Jorvik, there are two main types of construction in the 9th and 10th century. The Coppergate excavations unearthed 4 townhouses in a row, the largest of which was of wattled and daub construction and measured roughly 7mx4m (if my memory serves). This was a single roomed dwelling with a central hearth and could have accommodated between 2 and 16 occupants (although closer to 10 would have been more regular). There is also evidence of a plank constructed building, single story, constructed slightly later. These are more established and possibly affluent structures in comparison to the cheap to construct wattled ones. The planks used were recycled from a Viking/Saxon ship. There is also some evidence for cellars being used for storage in these later phased buildings. They are arranged with aligned narrow frontages with rear garden/refuse areas. All toilets would be simple pits largely open to the air. Many industries took place from these houses including heavier industries like blacksmithing. Slag and associated accessories have been found within residential areas.

So home life and work would be very much intermingled, it can be assumed there fore that children would be watching their parents from a young age to learn their future trade. Its hard to say how typical this excavation is of the wider Viking world however there is no reason to think it is particularly exceptional example of town life. Jorvik is the second largest city in the country at this point with around 18,000 inhabitants. It would have been a smelly, busy place to live.

Almost nothing is made of stone, perhaps your church buildings but basically everything else is made of wood or other perishables. There is some mentions of in other parts of Jorvik into the Anglo Saxon period there are surviving Roman stone buildings but these have not been found. You must remember that both the Saxons and the Vikings were skilled wood workers and that wood was abundant. Stone however is heavy, time consuming and requires and entirely different skill set.

I hope this helps, ant questions I'll do my best to answer.

Source: I work at Jorvik Viking Centre.