A comfortable house for 4‒6 sims: three bedrooms (one of them empty), two baths, open dining and kitchen, living room, and another empty room that could be used as a study or nursery. Plus front and back porch and a small balcony on the back side.
This will fit on a 15×20 lot as shown (prices given below are including a 1.500§ lot).
Installation: Unzip and put the package in /Mods.
See here for how to package lots (this works the same way for sims). To uninstall, delete the package ‒ if you “delete” a lot from the Library, it is only being hidden and will remain hidden if you decide to re-download. See also this post (same thread):
Lot Size: 15×20
Lot Price (furnished): 58.212§