Alberto, welcome back. Studying the apartment diagram, it appears that the 16' length without the balcony might provide enough room for the LFR1100s. They should be a few feet from the wall behind so that the rear drivers have room to disperse their sound. You should sit far enough(say, at least 8')from the front drivers for their sound to blend before it reaches you. So, you'd probably have barely enough room to position the LFR1100s effectively.
If your primary use will be movies though, there are many where the surround effects are important to the enjoyment. Although it might be difficult to find a position for side surrounds, I'd still suggest that you consider them, rather than just mains. Possibly you could place QSs on high stands a few feet to the side of the listening position. Although the almost omni-directional dispersion of the LFR1100s adds greatly to the spaciousness, they alone don't provide the directional surround effects in movies which require actual speakers positioned as surrounds. Either the M80s or LFR1100s should be suitable for the mains.
