Our group (my mom, 2 year old, and I, on a girls' trip) had a fabulous stay here.
Sylvia's home is gorgeous and atmospheric - beautifully preserved original detail seamlessly blended with chic, curated decor.
The "two separate apartment" layout was no big deal at all - this felt like one large home. The beds are super comfortable and the lighting design was beautiful. There is plenty of space to spread out, and, for any remote work, a really nice workspace and fast wifi. From a family perspective, we liked the low bed, bathtub, elevator, and room darkening shutters for nap time.
The very central location, at the crossroads of a few neighborhoods, cannot be beat. The apartment is very close to all of the city center sights, but without a feel of being in a tourist trap, and other more authentic neighborhoods are also just steps away. We also appreciated the close proximity to transit (a bus stop and several metro lines) to get home after a long day of walking.
Sylvia is a kind and responsive host and this is an amazing place - we would count ourselves lucky to stay here again on our next trip to Madrid.