Stayed in the apartment at the start of June. The location couldn't be more perfect, only 5 mins walk from the main square in Madrid and only 2 mins away from the bus stop for the City Tour. The staff were really helpful and welcoming. The apartment had everything you could need for a stay in Madrid and was nicely presented.
One word of warning, if you opt for an apartment with a balcony, the street below gets pretty busy on the weekend so take that into account if you're a light sleeper.