I purchased an o-zone generator from MaxBlaster; that combined with a strong vinegar scrub on the walls and floors did the trick.

Disclaimer: I'm a 23 year old filled with piss and vinegar! 

(pillows and stuffed animals can be put directly in the dryer on high heat). we took all the furniture apart that we could, and covered the entire room with diatomaceous earth(including taking dresser drawers out and getting every nook and cranny- being thorough is key), pulling all small items, picture frames, legos, toys, candlesticks, anything on the walls, in the closets, storage items- everything we didn't cover in de, in the center of the room and/or soaked in tubs of vinegar. we wrapped the legs of all furniture that couldn't be taken apart with saran wrap, and placed them in shallow bowls of vaseline(makeshift trap). when the bedding and fabric items came out of the dryer, we bagged them in garbage bags, and secured the bags with packing tape, making sure there were no cracks or tears, then put them in the center of the room. 4. we did that to each bedroom, the living room, dining room, and bathroom. in the kitchen, we puffed de behind the switch plates with the foam inserts, and under appliances that generate heat(heat=bedbug food). 5. we let it sit like that for two weeks, and when we were done, we cleaned thoroughly. we bought a good handheld steamer for everything that could be steamed. we cleaned one room at a time, starting with a vacuum, and wiping the de of hard surfaces. we left de in the nooks and crannies(by the way- they CAN live behind wallpaper, and even the tags sewn onto mattresses), and made sure that everything we put back from the center of the room was steamed, vacuumed, or wiped off thoroughly. we replaced every mattress and bought good covers for each of them, as a preventative measure. also as preventative measures, we left the de under appliances, we left the foam inserts behind the switch plates, and for a few weeks after, we left the vaseline traps in place.

To remove wallpaper he always used vinegar and hot water.

Here is what I would do....saturate the area with vinegar then come back with baking soda on top of that.

Vinegar and water does work but it's labor intensive.

I’m of the firm opinion that you’ll get more flies with sugar than with vinegar. 

@Mindy Jensen,I would got to a big lots/dollar store and buy a couple of power toothbrushes. or get a good round brush into a longer bolt into your drill and have a go. or attach a stiff brush to a multitool/vibrating sander (i know you have at least one of those in your collection :-P )before bleach, first try peroxide + baking soda (or any oxy type of booster) + hot wateryou could try steam cleaning (not sure of effects of steam on porous travertine)source: whole tiled basement with former dirty owners and dogs. i didn't have travertine so i used some vinegar for boost. pretty clean after 3 moping-sessions.

But here are some tips on how to get rid of dead person smell: - Place an open box of baking soda in each room overnight - Clean all surfaces with vinegar and water solution (one part vinegar to ten parts water) - Open all windows and let air dry out for several days - Put bowls of white distilled vinegar around the house for three days.- If none of these tips work, call a professional cleaning company. 

They would also put bowls of white vinegar around the house, and the smell would be gone very quickly.