The place is very very central to the tourist crowd. We walked to almost all tourist destinations. If we needed to make use of transportation, there are subway and bus stations a minute or two away; or when we needed a taxi, we just hail one from outside the door of the building. Breakfast places, restaurants, groceries, shopping places, souvenir shops surround the apartment building. The famed Gran Via where you can shop til you drop is just a two-minute walk away.
The apartment is on the top floor and very quiet and secure. There is an elevator. The television has internet connectivity so we were able to watch English shows/movies using Netflix or YouTube instead of the television where mostly, if not all, are in Spanish. This is a thoughtful addition.
The kitchen is complete, with complimentary olive oil, vinegar, salt, and sugar. Towels are plentiful.
There were 3 of us and we were comfortable. Considering there is only one toilet and bath, four people would, I think, be the limit of being comfortable there. There are also 3 beds - 2 single beds and 1 queen size bed, good for 4 persons. Any additional will sleep on the living room sofas.
In the pictures, you will see that the ceiling slopes, like in the attic of houses, so tall people have to watch out a lot when walking around the apartment.
All in all, the place is great and we had a grand time.