First, the location, space, and customer service were all excellent! It is in a very central location to access all the sites as well as close to the main train station. There are also lots of great eateries and bars in the vicinity, and we always felt safe.
The customer service was wonderful. Very responsive and accommodating. At one point, we needed something and they brought it the next day.
It’s a good size apartment, albeit the rooms are smaller. The living space is large and modern. Overall, a comfortable space.
The biggest thing to be aware of is the street noise. We would not recommend if anyone in your group is a light sleeper. My husband and I were traveling with my parents and all four of us had a really hard time sleeping all week. The walls are paper thin and windows are single paned, so every tiny noise from inside or outside echos throughout. I’m a pretty heavy sleeper and even a man having a coughing fit one night woke me up. If you do book, I would suggest bringing earplugs and maybe a white noise machine. My poor husband and parents barely slept the whole week. Not the fault of the host as it’s an older building, but it’s something we wish we would’ve known before booking as not being able to sleep really impacted our time in Madrid.
Second smaller issue we had were the bathroom showers. Despite our best efforts, water was everywhere after showering — puddled all over the floor. Fortunately, their customer was excellent and they prompted brought us more towels the next morning to prevent slippage / falling.
All-in-all, would recommend for the location, space, and value but would caution if you’re with anyone who may be a bit more particular or doesn’t sleep well.