  Improved accessibility to the microkelvin temperature regime is important for
future research in quantum materials; for quantum information science; and for
applications of quantum sensors. Here we report the design and performance of a
microkelvin platform based on a nuclear demagnetization stage, engineered and
well optimized for operation on a standard cryogen-free dilution refrigerator.
PrNi5 is used as the dominant refrigerant. The platform provides a large area
for mounting experiments in an ultralow temperature, low electromagnetic noise
environment. The performance is characterized using current sensing noise
thermometry. Temperatures as low as 395 $\mu$K have been reached, and a
protocol has been established in which it is possible to operate experiments
below 1 mK for 95% of the time, providing an efficient cryogen-free microkelvin
environment for a wide range of science applications
