Very Friendly staff as in in all Melia hotels - which really is the most consistent i have seen in any chain.
The Melia in Madrid is huge - you would imagine since lots of customers walk through the service would be poor, but it was as good as always.
location: good if you are there for work - it is located where most offices are. to get to central Madrid it is a small can ride (around 10-15 Eur)
Fitness: well equipped gym (just some free weights and one multi gym along with couple of treadmills). Fresh towels, apples and water always there.
Unfortunately they close their pool anytime other than summer. which was disappointing since the temperature was 21 when i was there (pretty warm)
Rooms: tad old but well kept, cleanliness maintained well
events: they organized some great drinking games
Food: very consistently good food throughout my stay of 4 days