Definitely roomy! Our family of 5 adults had lots of room to spread out. The bath situation was great as the showers were also roomy and the water pressure and amount of hot water was super. We were concerned given the number of family members that we'd have to alternate showering in am and pm. No problem!
We loved having the washer and dryer available since our vacation continued beyond Barcelona and we got to leave with clean clothes. We didn't use the kitchen much but loved having the fridge. We also loved having the lift since going up stairs that many times a day would have been difficult.
The best part of Manuel's place is its location! It is just a 20 minute walk to Las Ramblas and Placa Catalunya and located right near a Metro station that took us everywhere. There are several markets right on the block and a great fresh produce store right across the street as well as pastry and coffee shops. There are also lots of reasonably priced tapas places and a great hair salon right on the same block - Pelu Arte. The flat is also quiet and has great balconies on the front. Being away from Placa Catalunya also kept us out of the way of large crowds and 24/7 noise,
Definitely consider getting a Spanish SIM card to last you the duration. The WiFi was not always reliable but having our phones as back up for the tablets really helped. The WiFi also came up with a message "weak security" so I didn't do any banking or other transactions needing security. In any case, we didn't spend much time surfing the web as we were having too much fun going to all the places that were easily accessible from our flat. The SIM card also allowed us to use Google Maps to find our way around. It was surprisingly inexpensive and the office was a couple of blocks away (in case you didn't get one elsewhere).
Our family vacation in Barcelona was a huge success and that was due in great part to our accommodations. Thank you, Manuel.