During our three days in Madrid, we had lunch here twice. There are two reasons for this. Firstly, for a very reasonable price you get a wide choice of starters, ample choice of mains, a beverage and a pudding.
Secondly, my girlfriend is from Peru and she loved the food. She says it's better than what you'd find in many traditional restaurants in Peru.
I do have two small observation. The ceviche was amazing on our first visit but tasted a little bit less fresh the second time.
The first time, we also got a huge plate of lomo saltado. The second time, I only got a bit more than half of that portion.