We truly wish we could 100% recommend Enrique's appartment on Plaza San Ildefonso but unfortunately we cannot.
It is a small but nice apartment but it has two major drawbacks that make it absolutely a no return for us. Both drawbacks are related to the difficulty of getting a decent night sleep.
The square where the apartment is located simply never sleeps. It is always busy and noisy, even in the middle of the night. The windows are of decent quality, blocking a lot of noise, but many sounds still penetrate in the apartment albeit in a tempered way. People passing by talking loud, sometimes shouting & yelling, or installing them on the square between 3 and 4 in the morning, as we experienced on our last Tuesday night, the almost daily rubbish collection around 4 am, etc. We are sensitive to night noise and for us it therefore was not a pleasant experience. Btw our sound app measured outside noise levels in the late evening of up to 81db which is horrific (lowest 60 db, highest 81db, average 71db) . But if you don't mind the noisy livelyhood of the square then this apartment might be a good choice for you. As mentioned it is small, and it does not have a separte bedroom (a wall partly devides the bed & wardrobe area from the living area), but inside it has all one needs, it is nicely decorated, it has a pleasant homely feeling, and it was clean (a special mention for the cleaning lady who did a great job).
The second drawback is the very small bed. We are talking about a 130 cm bed (we measured it), and only 190 cm long. This is such a pity, especially considering it has a good quality matress, but it definitely is far too small. 130x190 cm is not a sufficient size for a double bed. A queen size bed nowadays measures 150-160 cm, a king size bed 170-180 cm. Length should be at least 200 cm. How can you call a "double" bed measuring 130 cm ? We don't know. As we don't know why this friendly owner Enrique does't install a 160 cm bed. The present bed is super tiny, and therfore not comfortable enough for two people.
An additional, but minor drawback : the two balconies (one is taken by the aircon outside unit) are super small, it was not possible at all to sit outdoors at an (even tiny) table.