Staying in one place for a week has definite advantages over hopping from place to place. I know the rhythm of this city, have a favorite restaurant, and the days are easy, not rushed. Having time that isn't packed to overflowing with tasks or even want-tos is so refreshing.
Barcelona is a city for walking. My feet have covered miles of sidewalk and going somewhere beats the treadmill by far. Bicycles are everywhere and the government supplies bicycle stands with bikes to take from one place to another (they encourage use for a half hour at at time) and a biking path on the road. The crosswalks have a bicycle light as well as a pedestrian light. Lunch is around 2 and dinner at 8 or after and they eat for hours. Waiters don't bring the check until you ask for it. To do otherwise would be considered rude. There are very few fast food restaurants: I've seen one Burger King and one McDonald's. I've not seen a single convenience store offering sodas, candy, and chips though there are small groceries with fresh veggies and fruits. I don't think they snack.
And you see very few overweight people. Except in the hotel.