The place is perfect for both groups with 4-5 adults or family with 2-3 children. The apartment has a large master bedroom that possible to add 1 extra bed in it.
The location is just perfect. It's just 3 escalators away from Park Guel and ca. 25 m from Real Santuario De Sant Jose De La Montana. But we still get a quite and peaceful atmosfer.
Dont worry about transport. We need to walk 10 min only to Lesseps metro. On the way to Metro, we can find mini markets, places to get coffee and brunch or T-shirt if you need it :)
Parks and playgrounds also just some steps away from the apartment.
Last but very important is Pablo is very helpful and informative.
over all this apartment is the place you need to enjoy the beauty of Barcelona.