You can rent a 1 bedroom with a balcony in London that allows pets.

Ha ha ha, it's actually a studio, but the size of this studio is really amazing! It's not inferior to 1b! And the layout is also very similar to 1b, it's a blessing for sisters! Not only that, the apartment facilities are also first-class! There is a gym, a cinema room, complete furniture and appliances, it's really a feast for the eyes! And the most important thing is that there is a parking lot! It's so convenient, it's great! And the location is also quite good! It only takes 30 minutes by subway to get to UCL, and 12 minutes to get to the center of London! It's really a great location!