Aberconwy House, one of the best-preserved medieval houses in Wales, originating in the 14th century. Includes a house museum.
If you happen to visit Wales, you can find it on 2 Castle Street in the town of Conwy.
National Trust website for Aberconwy House
Visit Wales website for Aberconwy House
Geograph.co.uk entries for Aberconwy House
Wikimedia Commons entries for Aberconwy House
Conwy has several other preserved historical houses and buildings from earlier centuries. These include the later Tudor era Plas Mawr, which also has a house museum (and which I've already featured in this thread years earlier), and there's also the famous 'Smallest House in Great Britain' and plenty of preserved fortification monuments. Speaking of...
The 'Smallest House in Great Britain', in Conwy, a tourist attraction that's more on the cheesy side due to its notoriety/record, but is still a nice example of a period house centuries old, that was built in the spirit of "How can our ingenuity provide us with a small house and lodgings even in a narrow, cramped part of the street ?" vernacular ingenuity.
Official website for the Smallest House
Visit Conwy website for the Smallest House
Geograph.co.uk entries for the Smallest House
Wikimedia Commons entries for the Smallest House
Various narrow houses from around the world
English Heritage website for the Medieval Merchant's House in Southampton
Geograph.co.uk entries for the Medieval Merchant's House in Southampton
Wikimedia Commons entries for the Medieval Merchant's House in Southampton
Combine these photos with the medieval early modern housing and market hall photos from my previous post, and you'll have plenty of inspiration on how to furnish rural houses and townhouses in TDM's setting.