The Town Cottage is an additional home that you can own in Harvest Moon: Friends of Mineral Town.
The empty space next to Saibara's shop can be yours if you ask Gotz to build you a cottage there. The option to build the cottage will show up at Gotz's once you have purchased all the other upgrades from him. Building the cottage will cost 100,000,000 G as well as 999 pieces of lumber.
The interior is similar to your first farmhouse, before upgrades and expansions, complete with a TV set, a bed, a table, a diary to save in and a calendar. There will also be a mirror, fireplace and clock, but you do not have to buy them; they come with the house.