Help please!

Dear English-speakers! I need a grammatically correct reference for a job, correct mistakes please! 

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Reference for Daria Kuznetsova

Daria has been a housekeeper in Chekhov Hotel since 2011.

From the very beginning, Daria proved to be a very disciplined and responsible person. She is very attentive to details and doesn’t leave things undone. As her direct supervisor I never had to ask her to go back and clean an area again. She is professional and efficient in her approach to work and well-liked by her colleagues and guests of our hotel. 

I believe that Daria will make a valuable addition to any organization that she may join. We deeply regret her decision to leave the job in our hotel and I recommend her without any hesitation. 

I would gladly answer any request for further information.

Sincerely,

Lisina Julia
Head of the Cleaning Department

Suggested correction. Hope it helps!

Reference for Daria Kuznetsova

Daria Kuznetsova has been employed as a housekeeper at the Chekhov Hotel from 2011 to the present.

All throughout her period of employment with us, Daria has proven to be a very disciplined and responsible person. She is very attentive to details and thorough in carrying out her appointed duties. As her direct supervisor, I have never had to ask her to go back and clean an area again. She is professional and efficient in her approach to work, and is well liked by both her colleagues and the guests of our hotel.

I strongly believe that Daria will make a valuable addition to any organization that she may join. We deeply regret her decision to leave her job at our hotel and I recommend her without any reservation.

Please feel free to contact me if you require any further information.

Sincerely,

Julia Lisina
Head of cleaning department