Stephanie Hansen, 39, was found by police and paramedics with serious injuries at the property in Willenhall Drive, Hayes, just after 10am on Saturday.
She was sadly pronounced dead at the scene.
Sheldon Rodrigues, also of Willenhall Drive, has been charged with her murder, Scotland Yard confirmed on Tuesday.
He was due to appear in custody at Uxbridge Magistrates’ Court on Tuesday.
Rodrigues was arrested after officers were called to the property on Saturday morning, and found Stephanie dead inside the property with stab injuries.
He is understood to have been known to Stephanie.
Following her death, Stephanie’s friends have paid tribute to her on social media by calling her “a beautiful young lady and a remarkable environmental heroine”.
One friend, who volunteered alongside her during a litter-picking campaign in Cranford, said: “We are shocked and deeply saddened to hear the loss of our dear friend Stephanie Hansen on New Year’s Eve. Stephanie, a beautiful young lady and a remarkable environmental heroine.”
They added: “Her love for the natural world was unparalleled as was her dedication to cleaning and greening Cranford.
“She would trek every weekend from Hayes to Cranford to help with our local projects.
“We will miss her laughter, her boundless energy and fearlessness in tackling all things harmful to the environment. RIP Stef.”
Another friend said: “I will always remember Stephanie Hansen as a funny cheerful girl with her pink hoop. I can’t believe you are gone... You will be truly missed... rest in peace my beautiful friend...”
Detective Neil John previously said his thoughts were with Stephanie’s family, adding: “They have suffered an unimaginable loss and we will give them every support.”