Yes , this is a compact apartment and yes, you will likely get lost repeatedly going and coming (all part of the fun) but it's in the heart of the Alfama, a more atmospheric neighbourhood you could not find.
Antonio met us at the Fado Museum and guided us to the apartment, where we were welcomed with local wine and pastries.
You'll get to to know your travel companion intimately in those cozy space, but it's worth it!