I second the recommendation--excellent steaks, I recall the price was quite reasonable (several years ago, ok admittedly almost anything looked better than £ then).
A friend recently went there but the place was not open--it looks like they may decide not to keep it open on slow night. Definitely recommend calling ahead. I took a taxi from the hotel, the restaurant can call you a taxi on the way back.
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We went to Naomi Grill 2x in Aug 08. Most of the dishes were quite tasty - but the steak was not worth eating (either time). They pay a lot of attention to customers known to them, and mostly ignored us...but it was to be my only meat meals on a 12 day trip, so I was willing to tolerate bad service for good food.
We shall be in Madrid for an overnight layover in December.
did a Shabbos stay last Nov, went into La Escudilla before Shabbos hoping to buy some food, they had next to nothing and a chickhen leg (with maybe 5 or so bites to it was 18 Euro) I believe La Escudilla is a block or so from the shule which is in its own little dead end area, otherwsie I was in a different restaurant, they had no side dishes.