We stayed there twice on our way to / from Morocco. Both times the rooms were excellent, spotlessly clean and of a very high standard for a 3 star hotel. I've stayed in some 4 star hotels that haven't been as good as this, its at least 3.5 stars. Fantastic bathroooms complete with lots of free toiletries, and rooms were well insulated from any street noise.

Location is a 20 minute hike straight up the road to the main railway station (also an historic icon) and the cultural precinct with all its parks and the Royal Botanic gardens, as well as the amazing Prada museum. If the walk is a bit much, it's easy to get a taxi.

WiFi is available but you have to buy it, although you can get it for free in the foyer area. Breakfast isn't included and seemed very expensive, so we ate at cafes in the street.
Staff are helpful and friendly and were very efficient organising a taxi to the airport - which is a looong way away.

In summary, I'd definitely stay there again.

the hotel was given to me as four star but it is not. Can not carry heavy baggage no ramp at the entrance, it ha sonly steps. Just average stay. hotel employees not friendly. no wifi for free. which can really leave you stranded.

We spent three nights here in March 2011 for a short break in Madrid. Although the Metro stations are 10-15 minutes walk away there is a bus stop almost outside the hotel door and just hop on there, number 55 or 60 will drop you right outside various metro stations - no need to walk anywhere. Just buy the tourist metro ticket for 3 days and you never have to pay for buses or metros even to the airport. Because of this we found the location quite convenient and travelled easily all over the city. The room was a bit small and dark and looked out onto a central well, but it was comfortable and clean and the bathroom was very well equipped. Staff were very helpful and we were able to leave our luggage all day before going to the airport. Breakfast was good with plenty to choose from. I would stay there again without any worries. Not luxurious but good value for the money.

We spent 3 days including new year's day.
The hotel is in a safe area. The closest Metro station is Delicias (5/10 mins walking), and the centre of the town (Sol) is only 4 metro stations away on the same line (yellow)
The hotel lobby is very nice, the rooms clean and the bathroom very big and with lots of amenities (shampoo, hairdrier etc.).
The breakfast buffet is good and well varied, too.
Don't use the hotel internet connection, very expensive, but go to the internet points along the street to the Metro station, which costs 0.6 eur/hour