Great location - very central - we didn't use public transport the whole weekend, we walked everywhere. More tapas bars than you could possibly do in a weekend within 10/15 mins walk (and we tried!). The apartment is small, but perfect for what we needed - and the little balcony is a nice extra to have a pre-dinner drink by in the evening. There was also some coffee/milk/oil etc in the kitchen for us, perfect for making our own breakfasts. Previous reviews mentioned the noise - but the balcony door has clearly since been double-glazed so it's now super quiet. Would definitely recommend this apartment if you want a base from which to explore the central old town Madrid for a weekend.