  We present and analyse an architecture for a European-scale quantum network
using satellite links to connect Quantum Cities, which are metropolitan quantum
networks with minimal hardware requirements for the end users. Using NetSquid,
a quantum network simulation tool based on discrete events, we assess and
benchmark the performance of such a network linking distant locations in Europe
in terms of quantum key distribution rates, considering realistic parameters
for currently available or near-term technology. Our results highlight the key
parameters and the limits of current satellite quantum communication links and
can be used to assist the design of future missions. We also discuss the
possibility of using high-altitude balloons as an alternative to satellites.
