It will join the 239-bedroom Amba Charing Cross, which rebranded from a former Guoman hotel in December 2014.
With just over 900 bedrooms by the end of the year, Amba will be behind the target GLH Hotels set at the launch of the brand nearly two years ago. In October 2013, the company said it intended to have 2,088 rooms operating under the Amba badge by 2015.
By the time of the relaunch the hotel will have a strong focus on technology with fast and free Wi-Fi, Samsung Smart TVs and tablets in every bedroom. The rooms will also offer Nespresso machines and a complimentary mini-bar. Meanwhile, the multi-million pound refurbishment of all the bedrooms and public areas has included a training programme to multi-skill all the staff.
Mike DeNoma, chief executive of GLH, said the TripAdvisor success of Amba Charing Cross - which achieved the fourth spot in the listing of London hotels on the online review site six months after opening - demonstrates "how the brand has listened to customers" in order to address the needs of international guests.
"Retaining our position as a digital innovation leader as we develop the Amba hotel portfolio is a key promise to guests and owners alike."
Amba is one of five brands operated by GLH alongside the Clermont , Every, Thistle and Thistle Express. The luxury Clermont brand is yet to launch, although the Royal Horseguards was originally earmarked to be rebranded as the Clermont hotel in 2014.