Is Mango Lounge in Earl's Court London a nice lounge where to have good cocktails?

yeah its pretty nice

Have a look at the review on:
http://www.viewlondon.co.uk/
I think they are pretty convincing in the praise for the place.

You could also go to Mr Wing's it is a good place, I was very pleasantly surprised by this one which is just down the bottom of Earls Court |Road. The décor is a funky mix of eclectic euro oriental in the bar/lounge area upstairs, which is so unusual for a Chinese restaurant, and a paradise of tropical plants with thirty feet fish tank in the downstairs dining area. The food and service equally measured up to the surroundings and the prices were very reasonable given the high quality. There is even live jazz in the basement on Fridays and Saturdays. My favourite dish was their signature aromatic crispy duck, which was excellent. If you’re not looking for a traditional Chinese restaurant and if you want to impress, then I would highly recommend Mr Wing. The cocktails ar4e good as well.

Mr Wing Restaurant & Bar 242-244 Old Brompton Road, London, SW5 0DE
Tel: 020 7370 4450
Opening Times: Mon - Sun: 12:30 - 24:00

Best of luck